Team MaCEPV - Materials for electronic and photovoltaic devices

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  • A Research director joined the MaCEPV team:

Evelyne Martin joined the MaCEPV team on the 1st of September, 2020.


  • An associate professor has been recruited:

Yaochen Lin joined the MaCEPV team on the 1st of September, 2020.


  • MaCEPV Mi-term defense :

Monday June 29, 2020 at 10:00, room 15 of Building 40 (Campus CNRS Cronenbourg)

"Non-fullerene acceptors for organic photovoltaics"
by Amina Labiod (2nd year PhD student)

Presentation will be in french.


  • MaCEPV Mi-term defense :

Friday, June 26, 2020 at 10:00, meeting room of building 28 (Campus CNRS Cronenbourg)

"Dynamics of excitons and transport of charge carriers in organic thin films ordered for photovoltaic applications"
by Jiang Jing (2nd year PhD student)

Presentation can be seen via Zoom (https://us02web.zoom.us/j/88673248616?pwd=akY3RVpaczdMcXRQZWRpeUxkMGlndz09).


  • MaCEPV invited seminar  :

Monday, February 24 2020 at 11:00, room 40 Building 40 (Campus CNRS Cronenbourg)

"Atomic scale modeling of thermal conduction in nanomaterials" by Evelyne Martin (IEMN, Lille)


  • MaCEPV invited seminar  :

Friday, January 10 2020 at 11:00, room 40 Building 40 (Campus CNRS Cronenbourg)

"Ion implantation and Electronic Paramagnetic Resonance: key tools for quantum technologies" by Jérôme Tribollet (Institut de Chimie, Strasbourg)


  • Invited seminar  :

Tuesday, December 17 2019 at 11:00, Room 40, Building 40 (Campus CNRS Cronenbourg)

"Engineering Energy Levels at the Donor-Acceptor Interfaces for Efficient Charge Separation in Organic Solar Cells"
by Pr Gjergji Sini, University of Cergy-Pontoise, Neuville sur Oise, CERGY-PONTOISE, FRANCE


  • MaCEPV thesis defense :

Tuesday, October 22 2019 at 14:00, Amphitheater Grünewald (Campus CNRS, Cronenbourg)

"UV laser treatments of amorphous adamantine carbon (DLC) layers obtained by pulsed laser deposition (PLD): Application to the synthesis of transparent electrodes"
par François Stock


Jury members :
Antoni Frédéric, Professor, ICube, Université de Strasbourg (Thesis director)
DELAPORTE Philippe, Research Director-CNRS, LP3, University of Marseille (Reviewer)
GARRELIE Florence, Professor, LHC Director, University of Saint-Étienne (Reviewer)
VIART Nathalie, Professor, IPCMS, University of Strasbourg (Examinator)
FONTAINE Joël, Professor, ICube, INSA Strasbourg (Invited member)
AUBEL Dominique, Assistant professor, IS2M, University of Haute-Alsace (Invited member)
Mme HAJJAR-GARREAU Samar, PhD, IS2M, University of Haute-Alsace (Invited member)


  • Invited seminar  :

Thursday, September 19, 2019 at 10:30, Amphitheater Grünewald, Building 25 (Campus CNRS Cronenbourg)

"Atom Probe Tomography"
by Dr Peter Clifton from CAMECA Society


  • Invited seminar :

Wednesday, September 11, 2019 at 15:30, Fermi Amphitheater, ECPM (Campus CNRS Cronenbourg)

"Recent development of ternary solar cells from materials and device physics" by Prof. Fujun Zhang (Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University)


  • MaCEPV seminar :

Wednesday, July 10, 2019 at 11 am, Room 40 of Building 40 (Campus CNRS Cronenbourg)

"Optimisation of silicon clathrates for optoelectronic and photovoltaic applications" by Yahia Salah (M2 Medsol internship)


  • MaCEPV seminar :

Wednesday, July 3, 2019 at 10 am, Room 20 of Building 40 (Campus CNRS Cronenbourg)

"Detection of pollutants by plasmonic route" by Abdelrahman Ahmed (M2 Medsol internship)

"TCO fabrication and characterization" by Saad Makhladi (M2 Medsol internship)


  • MaCEPV thematic half-day :

1/2 DAY POSTPONED

Wednesday, June 19, 2019 at 2 pm in Room 25 of Building 40 (Campus CNRS Cronenbourg)

"Sensors" by Nicolas Javahiraly and Dominique Muller

"Detection of pollutants by plasmonic route " by Romain Vollondat (M2 student)


  • MaCEPV invited seminar :

Monday, June 17, 2019 at 11 am in Room 40 of Building 40 (Campus CNRS Cronenbourg)

"Photovoltaic Research at University of Oslo (UiO): Defects in Semiconductors" by Eduard Monakhov

Abstract:
The presentation describes PV research at MiNaLab, Department of Physics, University of Oslo. The activity is a part of The Norwegian Research Center for Sustainable Solar Cell Technology. This is an 8-year nationally coordinated project between different research partners and is financed by the Norwegian Research Council and the industry. The research at MiNaLab is focused on two main topics: (i) defects and impurities in solar Si and (ii) novel materials for tandem solar cells. As indicated in the title, defects are a critical element in these investigations. Si production is an important industry in Norway. Besides, a lion share of presently installed and produced solar cells are based on Si. Two issues are of particular interest for us: vacancy-oxygen complexes and the so-called light induced degradation (LID). I will give a short introduction to these issues and report on some recent results. Tandem solar cells are perhaps the most successful and proven approach to overcome the Shockley-Queisser limit. Present tandem cells are based on relatively expensive compounds. Our approach is to combine a Si-based cell (as a bottom cell) with a cell based on a “novel” material (as a top cell). One of such “novel” material is Cu2O. Challenges in the implementation of Cu2O as an active absorber material will be discussed.


  • MaCEPV seminar :

Wednesday, June 12, 2019 at 11 am in Room 25 of Building 40 (Campus CNRS Cronenbourg)

"A Path to Move Beyond The Lithography Resolution Limit Using Infiltration Synthesis on Directed Self-Assembled Block Copolymers - Challenges and Opportunities in Nanomaterials for Semiconductor and Energy Applications" by Yves-André Chapuis

Abstract:

Directed self-assembly (DSA) of block copolymers (BCPs) has long been viewed as a powerful alternative to extend the resolution of optical lithography in semiconductor industry. For full-area patterning applications, despite significant progress, the DSA method is facing a scalability challenge to transfer sub-10 nm patterns. One potential solution to greatly enhance the pattern transfer issue is a technique called sequential infiltration synthesis (SIS). SIS is a self-limiting synthesis technique, using atomic layer deposition (ALD), where organometallic precursor vapors and oxidants are introduced into self-assembled block copolymer systems to form metallic oxide mask and enhance plasma etch contrast. In this presentation, the SIS of DSA will be addressed for bit patterned media (BPM) fabrication of next-generation hard-disk drive (HDD), as developed at HGST1. Process flows and fundamental mechanisms of this nanopatterning approach will be reviewed with manufacturing demonstration of disk areal densities about 2.0 Tbit/in2. New insights of the ALD based-SIS process will be also discussed with opportunity in storage energy applications as solar and battery. 1HGST is a subsidiary of Western Digital Corporation that manufactures and sells hard disk drives (HDDs) and solid-state drives (SSDs). The research center of HGST is localized in San Jose, CA, USA.


  • MaCEPV seminar :

Friday, June 7, 2019 at 11 am, Room 25 of Building 40 (Campus CNRS Cronenbourg)

"Graphic thin films obtained from thermocatalytically treated diamond-like carbon (DLC) films, applied to the conductivity of transparent films" by François Le Normand


  • MaCEPV mid-term defense:

Thursday, April 4, 2019 at 2pm, room 25 of building 40 (Campus CNRS Cronenbourg)

"High performance organic solar cells processed from bio-solvents" by Jing Wang (2nd year PhD student)


Thesis supervisor: Thomas Heiser

Doctoral School: MSII

Mid-thesis jury: Paul MONTGOMERY (ICube) and Anne Hébraud (ICPEES)


  • MaCEPV invited seminar  :

Tuesday, March 5, 2019 at 11am, room 40 of building 40 (Campus CNRS of Cronenbourg)

"The doping of SiC, a key step in a technology applied today in power components and targeted for a robust nanophotonics" par Mihai Lazar (L2n, Troyes)

Summary:

Until now, Mihai Lazar's research activities around wide bandgap semiconductor technology have focused on the integration of several features, especially for power electronics, high temperature and sensors for various harsh environments. To achieve these objectives, his research at the Ampère laboratory in Lyon (formerly CEGELY) focused on the production of components through innovative technological processes and new architectures adapted to the specificities of these semiconductor materials. In this SiC technology, ion implantation doping steps and other alternative methods (such as VLS) are a central part of this seminar. Exemplary embodiments of discrete and monolithically integrated SiC power components will be presented. The functioning of certain components is directly related to the impact of the channelization of ions implanted in hexagonal SiC-4H and the control of this phenomenon. The experience gained in the development of SiC technology for power electronics has allowed Mihai Lazar to open up to other application fields including that of a SiC nanophotonics and the realization of sensors for various harsh environments, through academic or industrial projects in Lyon and more recent missions to the INSP and ESYCOM / ESIEE laboratories. His research is now increasingly oriented towards the development of a nanotechnology for a robust SiC nanophotonics that will be developed on the Nano'Mat platform of the L2n (former LNIO) team which he has come closer and integrated since the end. 2018. The doping of SiC and the engineering of faults thus created are still essential steps. At L2n, today and in the years to come, his research will focus on (i) white light LEDs in nanostructured SiC with anti-glare layers, (ii) the definition of QDs based on control and implementation. resonance of color-centered defects in SiC, single-photon sources in the visible and (near) infrared, (iii) the interaction and the plasmonic coupling of metal nanostructures on the SiC surface to improve, among other things, the emission efficiency of "Classic" LEDs with white light or those based on the resonance of colored centers.


  • MaCEPV PhD defense:

Monday, December 17, 2018 at 9.30 am, Grünewald Amphitheater of Building 25 (CNRS Campus Cronenbourg)

"Elaboration and characterization of thin films all oxide for photovoltaic components" by Alessandro Quattropani.


Jury:

Thesis director: M. SLAOUI Abdelilah (Researcher director, ICUBE Strasbourg)

Reviewers: Mme. BESLAND Marie-Paule (Researcher director, IMJR, Nantes et M. EL MARSSI Mimoun (Professor, LPMC Université de Picardie, Amiens)
Members: Mme. VIART Nathalie (Professor, IPCMS, CNRS-Université de Strasbourg)
Invited members: M. DINIA Aziz (Professor, IPCMS, CNRS-Université de Strasbourg) et M. FIX Thomas (Researcher, ICube, CNRS-Université de Strasbourg)


  • Day of the "Grand Est" Nanofabrication Platform Network (RANGE):

Tuesday, November 13, 2018 at 9:30, Grunewald amphitheater (Campus CNRS Cronenbourg)

The RANGE network is organizing a meeting of actors from the nanofabrication platforms of the Grand Est on November 13, 2018 at 9:30 am at the Grunewald amphitheater of the Cronenbourg campus.
Scientific presentations related to nanofabrication will be given by researchers from the Jean Lamour Institute (Nancy), the Charles Delaunay Institute (Troyes), the IPCMS (Strasbourg) and ICube.
Thank you for reporting to participate in this meeting.

Contact: dominique.muller@icube.unistra.fr

PROGRAM


  • MaCEPV HDR defense:

Wednesday, September 26, 2018 at 10:15 am, Grünewald amphitheater of building 25 (CNRS Campus Cronenbourg)

"Transport of efficient and isotropic free charges in organic semiconductors" by Patrick Lévêque.


Jury:

Reviewers: Pr. Bernard RATIER (Institut XLim, Limoges), Pr. Kamal LMIMOUNI (IEMN, Lille), Dr. Lionel HIRSCH (IMS, Bordeaux)
Members: Pr. Daniel MATHIOT (ICube, Strasbourg), Dr Loïc MAGER (IPCMS, Strasbourg) et le Pr. Thomas HEISER (ICube, Strasbourg)


  • MaCEPV Seminars:

Monday, July 16, 2018 at 11am, room 40 of building 40 (Campus CNRS Cronenbourg)

"Detection of pollutants by plasmonic route " by Hamza Settouti (M2 student)
"Optimization of photoluminescent Si and SiGe nanoparticles synthesis by pulsed laser deposition (PLD)" by Laura Diebold (M2 student)


  • MaCEPV recent publication  :

Ibraikulov et al., J. Mater. Chem. A, 2018, 6, 12038

The results presented in this article by the MaCEPV team and its partners show that the volume of the alkyl chains controls the orientation of the polymers relative to the substrate whereas the functionalisation by fluorine atoms of the conjugated core reinforces the inter-molecular coupling. Together, these two effects are proving to be essential to achieve a photovoltaic conversion efficiency higher than 10%.

JMatChemA2018


  • MaCEPV thematic half-day:

Friday, July 6, 2018 at 9am, room 40 of building 40 (CNRS Campus Cronenbourg)

"Nanoparticles: fabrication methods, characterizations and applications" by Frédéric Antoni, Gérald Ferblantier, Daniel Mathiot and Emilie Steveler


  • MaCEPV Seminars:

Wednesday, July 4, 2018 at 11am, room 40 of building 40 (Campus CNRS Cronenbourg)

"Elaboration and characterization of silicon-based thin films containing nanoparticles" by Naoufal Ennouhi (M2 student)
"Realization of Transparent Conductor Oxides based on tin oxide" by Manale Battas (4th year PhD student)


  • MaCEPV Thesis defense:

Tuesday, July 3, 2018 at 1:30 pm, Grünewald Amphitheater of Building 25 (CNRS Campus Cronenbourg)

"Growth and characterization of functional nano-crystals of Si1-xGex possibly doped in various dielectric matrices" by Abdellatif Chelouche


Jury composition:

Thesis director: Mr MATHIOT Daniel (Professor, University of Strasbourg)
Co-supervisor: Mr. FERBLANTIER Gérald (Lecturer, University of Strasbourg)
Reviewers: Mr RINNERT Hervé (Professor, University of Lorraine) and Mr BEN ASSAYAG Gérard (Research Director, CEMES Toulouse)
Examiners: Mrs. CARRADA Marzia (Research Officer, CEMES Toulouse), Mrs. CARRADO Adele (Professor, University of Strasbourg)
Invited Member: M. MULLER Dominique (Research Engineer, ICube Strasbourg)


  • MaCEPV Seminar:

Monday, June 25, 2018 at 2pm, room 40 of building 40 (Campus CNRS Cronenbourg)

"Chemical sensors based on organic field effect transistors" by Jean-Philippe Brach (M2 student)  


  • MaCEPV mid-term defense:

Thursday, May 24, 2018 at 10am, room 25 of building 40 (Campus CNRS Cronenbourg)

"Growth of graphene layers by laser ablation (PLD) of carbon: application to the synthesis of electrodes on transparent substrates" by François Stock (2nd year PhD student)


  • MaCEPV Seminar:

Monday, May 14, 2018 at 11am, room 25 of building 40 (Campus CNRS Cronenbourg)

"Synthesis and Characterization of Carbon thin films by Pulsed Laser Deposition and silicon nanoparticles" by Chinmayee Chowdegowda (M2 student)


  • MaCEPV Seminars:

Thursday, April 12, 2018 at 11am, room 40 of building 40 (Campus CNRS Cronenbourg)

"Synthesis and Characterization of Carbon thin films by Pulsed Laser Deposition" by Chinmayee Chowdegowda (M2 student): this seminar is postponed to a later date.

"Optimisation of Organic Solar Cells based on Polymer:Fullerene Blend" by Anusha Hiremath (M2 student)


  • Invited seminar:

Monday, February 26, 2018 at 11am, room 40 of building 40 (Campus CNRS de Cronenbourg)

Presentation of his project for the CNRS entrance competition by Matteo Balestrieri


  • MaCEPV Seminars:

Thursday, February 22, 2018 at 11am, room 40 of building 40 (Campus CNRS of Cronenbourg)

" Elaboration and characterization of Zn-Sn-O thin films for solar cells " by Abid Toudmir (M2 student)

" Characterization of DLC layers on transparent substrates for transparent electrodes " by Jamal El Hamouchi (M2 student)


  • Invited seminar:

Wednesday, February 14, 2018 at 11am, room 40 of building 40 (Campus CNRS of Cronenbourg)

" Polymer / metal hybrid nanoparticles " by Renaud Bachelot (UTT/L2N)


Hybrid nanomaterials are targeted by a rapidly growing group of nanooptics researchers, due to the promise of optical behavior that is difficult or even impossible to create with nanostructures of homogeneous composition. Examples of important areas of interest include coherent coupling, Fano resonances, optical gain, solar energy conversion, photocatalysis, and nonlinear optical interactions. In addition to the coupling interactions, the strong dependence of optical resonances and damping on the size, shape, and composition of the building blocks provides promise that the coupling interactions of hybrid nanomaterials can be controlled and manipulated for a desired outcome. Great challenges remain in reliably synthesizing and characterizing hybrid nanomaterials for nanooptics. We review and describe the synthesis, characterization, and applications of new hybrid plasmonic nanomaterials that are created through plasmon-induced photopolymerization. Involved polymer can contain active species, resulting in advanced hybrid nano-emitters The work is placed within the broader context of hybrid nanomaterials involving plasmonic metal nanoparticles and molecular materials placed within the length scale of the evanescent field from the metal surface. We specifically review three important applications of free radical photopolymerization to create hybrid nanoparticles: local field probing, photoinduced synthesis of advanced hybrid nanoparticles (including light-emitting nanosystems), and nanophotochemistry. We first demonstrate that nanoscale photopolymerization is possible at the surface of Ag nanoparticles,[1,2] gold nanocubes[3] and within the gap between two coupled metal nanoparticles.[4]This local polymer integration enables symmetry breaking, quantification of plasmonic near-fields and trapping of molecules whose Raman signature gets amplified. Secondly, we show that it is possible to integrate quantum nanoemitters in the vicinity of plasmonic nanostructures with high spatial precision via two-photon polymerization.[5] In particular, we demonstrate two-color nanoemitters that enable the selection of the dominant emitting wavelength by varying the polarization of excitation light. The nanoemitters were fabricated by using two polymerizable solutions with different quantum dots, emitters of different colors can be positioned selectively in different orientations in the close vicinity of the metal nanoparticles. The dominant emission wavelength of the metal/polymer anisotropic hybrid nanoemitter thus can be selected by altering the incident polarization.

[1] Phys. Rev. Lett. 98, 107402 (2007) [2] ACS Nano 4, 4579 (2010) [3] J. Phys. Chem C. 116, 24734 (2012) [4] ACS Photonics 2, 121 (2015) [5] Nano Letters 15, 7458 (2015)


  • MaCEPV Seminars:

Friday, January 25, 2018 at 11am, room 25 of building 40 (Campus CNRS Cronenbourg)

"Burn-in effect in fullerene-based organic solar cells" by Jing Wang (1st year PhD student)


  • MaCEPV Thesis defense:

Friday, December 8, 2017 at 2pm, Grünewald Amphitheater building 25 (Campus CNRS Cronenbourg)

" Optically addressed light modulators composed of an organic photovoltaic layer " by Thomas Regrettier


  • MaCEPV Thesis defense:

Thursday, November 30, 2017 at 2 pm, Henri Benoît Amphitheater of the Charles Sadron Institute (CNRS Campus of Cronenbourg)

" Organic solar cells with heterojunction in volume from solution based on triazatruxene derivatives " by Tianyan Han


  • MaCEPV Seminars:

Friday, April 28, 2017 at 11am, room 40 of Building 40 (Campus CNRS Cronenbourg)

" RBS et NRA measurements " by Dominique Muller (research engineer C3-Fab)

" Ionic implantation " by Yann Le Gall (engineer C3-Fab)


  • MaCEPV Seminars:

Friday, February 3, 2017 at 10am, room 40 of Building 40 (Campus CNRS Cronenbourg)

"Molecular engineering of luminescent dyes based on an Excited-State Intramolecular Proton Transfer (ESIPT)" by Gilles Ulrich

"Charge-carrier dynamics in BHJ P3HT:PC61BM." by Patrick Lévêque (Associate professor)


  • Invited seminar:

Wednesday 4th January 2017 at 2pm, room 40 of building 40 (Campus CNRS of Cronenbourg)

"Multi-functional and photoaddressable hybrid liquid crystals" by Malgosia KACZMAREK (Department of Physics and Astronomy, University of Southampton, United Kingdom)


Future photonic devices require smart micro- or nano-components that are active and tuneable, with dynamically controlled optical properties. One the most promising routes towards their practical realization is to hybridise the fabric of organic or inorganic, photoresponsive materials with liquid crystals. Such hybrid configurations have been successfully demonstrated in the visible, infrared as well as in the THz regimes. They include liquid crystals integrated with plasmonic or ferroelectric nanoparticles, photoactive polymers as well as metamaterials. They offer adaptive, flexible and tailor-made solutions for applications in displays and optoelectronics, switching, steering and modulating electromagnetic waves.
In particular, our group has recently demonstrated efficient spectral tuning of liquid crystal-metamaterial system in the visible, achieved by reorienting liquid crystal molecules in a specially designed nano-structured, plasmonic membranes using in-plane electric field. In this design, liquid crystals acted as a macroscopic, dielectric medium with controlled optical anisotropy. The modulation of refractive index were hysteresis-free and extraordinary large and the extent of spectral tuneability was approximately 15%. Furthermore, liquid crystal can be used as a functional component exploiting their elastic properties. We have experimentally demonstrated that through elastic coupling to the specially designed metamaterials, liquid crystals can efficiently modify the character of the nanoscopic actuations.
Another example of promising photoresponsive, hybrid materials are azo-dye photoaligning layers integrated with liquid crystals. The focus of previous investigations was on non-mechanical, light driven orientation of liquid crystals in such systems. We have studied the optically induced changes in thin, 20 nm azo-dye layers, in particular their anisotropy and structuring.


  • MaCEPV Thesis defense:

Thursday 1st December 2016 at 2pm, Marguerite Perey Amphitheater Building 1 (Campus CNRS Cronenbourg)

"Bulk heterojunction solar cells based on low band-gap polymers and soluble fullerene derivatives" by Olzhas Ibraikulov

Composition of the jury:

Thesis Director: Thomas Heiser, Professor, University of Strasbourg
Co-Supervisor: Patrick Leveque, Associate professor, University of Strasbourg
Reviewers: Uli Wuerfel (Doctor, Head of Department, Fraunhofer ISE, University of Freiburg, Germany) and Yvan Bonnassieux (Professor, Ecole Polytechnique, Paris, France)
Jury members: Alexander Alekseev (Ph.D., Head of Photovoltaic Laboratory, University of Nazarbayev, Kazakhstan) and Stefan Haacke (Professor, University of Strasbourg)

  • Invited seminar:

Thursday 1st December 2016 at 10am, room 40 of building 40 (Campus CNRS Cronenbourg)

"Modeling of organic device from Organic Thin Film Transistor (OTFT) to Organic ElectroChemical Transistor (OECT)" by Yvan BONNASSIEUX (Ecole polytechnique, Palaiseau)


  • MaCEPV Seminars:

Tuesday, July 19, 2016 at 2pm, room 40 of building 40 (Campus CNRS Cronenbourg)

" Study of the synthesis of SiGe nanoparticles by pulsed laser deposition (PLD) on insulating substrates " by François Stock (M2 student)

" Redistribution of Ge implanted in SiO2-based dielectric layers" by Thibault Haffner (M2 student)


  • MaCEPV mid-term defense:

Wednesday, June 29, 2016 at 10:30 am, room 40 of building 40 (Campus CNRS of Cronenbourg)

" Study of doped semiconductor nanocrystals for integration into components of the silicon industry " by Abdellatif Chelouche


  • MaCEPV mid-term defense:

Wednesday, June 22, 2016, room 20 of building 40 (Campus CNRS of Cronenbourg)

- at 10:30 am : " Integration of III-V semiconductor materials into more advanced silicon manufacturing processes " by Florian Le Goff (CIFRE, Thalès III-V Lab, Palaiseau)

- at 1:15 pm: " Study of physicochemical behavior of dopants in II-VI semiconductors for infrared detection " by Thomas Grenouilloux (CIFRE, Sofradir et CEA, Grenoble)


  • MaCEPV mid-term defense:

Friday, June 10, 2016 at 10am, room 40 of building 40 (CNRS Campus of Cronenbourg)

"Triazatruxene derivatives as donor materials for bulk heterojunction solar cells" by Tianyan Han


  • Invited seminar:

Wednesday 4 May 2016 at 2 pm, room 40 of building 40 (CNRS Campus of Cronenbourg)

"Nanoporous fullerene thin films as acceptor templates for organic photovoltaics" by Jean-Nicolas TISSERANT (ETH ZURICH, Suisse)


ABSTRACT : "Fullerene thin films having morphological features on a scale of a few tens of nanometres are appealing for organic photovoltaics where they could improve charge separation and the overall cell performance, compared to planar films. We developed a method based on interfacial nucleation and growth to produce 2D percolating films of C60 nanoparticles with diameters between 10 and 50 nm. The benefit of such nanoporous films is illustrated on organic solar cells of the architecture ITO/TiO2/C60/P3HT/MoO3/Ag, where P3HT was infiltrated in a nanoporous C60 template. This template approach is especially suited for donor/acceptor molecules that do not spontaneously form an optimal bulk heterojunction morphology.


  • Invited seminar:

Friday 22nd of April 2016 at 11am, room 40 of building 40 (CNRS Campus of Cronenbourg)

" Perspective on carbon materials: graphene by pulsed laser deposition " par Teddy TITE (Laboratoire Hubert Curien, Saint-Etienne)


Despite its out-of-class properties, perfect graphene ("pristine graphene") has many disadvantages (no bandgap, chemical inertia ...) and for practical applications, it is necessary to alter its structural and electronic properties [1]. Many ways have been explored in this sense, such as texturing and surface functionalization by impurities and defects. In this context, the design of new architectures has become a real challenge for the development of new SERS sensors (Surface-Enhanced Raman Scattering) and electrochemical sensors. It should be noted that in parallel with these advances, new methods for synthesizing graphene from a solid source of carbon have emerged. However, it is surprising that their applications have so far been little explored. In this seminar, we report the synthesis of graphene from DLC (Diamond-Like-Carbon) layers produced by laser ablation and we will explore the applications of this new type of material as SERS sensors for pesticide and electrochemical detection. for molecular grafting. [1] K. S. Novoselov et al., Nature, 490, 192 (2012).


  • MaCEPV Thesis defense:

Thursday 31st March 2016 at 1:30 pm, Henri Benoît Amphitheater of the Charles Sadron Institute (CNRS Campus in Cronenbourg)

"RE-Doped SnO2 oxides for efficient UV-visible to Infrared photon conversion: application to solar cells" by Karima Bourras


This work focused on the synthesis and structural, optical and electrical characterization of tin oxide films (SnOx) doped with rare earth elements (RE: Neodymium, Praseodymium or Ytterbium). The objective is to demonstrate the conversion of UV or even Visible photons into red photons via these RE-SnOx films, while preserving their transparent conductive oxide properties. The films were produced by chemical methods (sol-gel, precipitation) or physical (sputtering). Thanks to fine analyzes, we have been able to correlate the structural and compositional properties of the RE-SnOx layers with their photon emission properties. We have been able to establish optimal conditions for photon conversion in single or double rare earth systems. The mechanisms governing the transfer in these films have been advanced. Finally, we applied these optimized RE-SnOx on solar cells in silicon and CIGS and we showed an improvement of the photovoltaic parameters of the device as well as a clear gain in the spectral response of the cell in the UV.

  • Invited seminar:

Thursday 31st March 2016 at 11am, IPCMS Auditorium (CNRS Campus Cronenbourg)

"the only way for Photovoltaics is up" by Jef Poortmans (IMEC, Leuven, Belgique)


ABSTRACT : Due to the strongly decreased prices of PV-modules, the increased weight of the Balance-of-system costs is a strong driver to increase performance in efficiency and energy yield. The presentation will deal with the midterm approaches under study at IMEC to improve crystalline Si solar cells and advanced thin-film PV materials with the aim to realize efficiencies of 30% under 1 sun.


  • Invited seminar:

Tuesday, February 23, 2016 at 11am, room 40 of building 40 (CNRS Campus of Cronenbourg)

"Correlation between polymer architecture, mesoscale structure and photo­voltaic performance in polymer:fullerene bulk-heterojunction solar cells" by Silke Rathgeber (Institute for Natural Sciences, University Koblenz-Landau, Koblenz, Germany / Technology Institute for Functional Polymers and Surfaces GmbH, Neuwied, Germany)


ABSTRACT : The structural properties of active layers of polymer:fullerene bulk: heterojunction solar cells were investigated by grazing incidence wide-angle x-ray scattering (GiWAXS). In particular the talk will focus on the effect of side-chain substitution of the polymer component, fullerene derivatization and blending with near IR sensitizers. The system under investigation are poly(arylene-ethynylene)-alt-poly(arylene-vinylene) (PAE-PAV) copolymers and poly(3-hexylthiophene). The structural results will be discussed in relation to the photovoltaic performance of the active layers in the device. Furthermore, a brief introduction will be given on the correct evaluation of GiWAXS data in the (q||, q^)-plane and extracting structural information of weakly ordered materials in the bulk.


Vendredi 12 juin 2015 à 14h15 à l'amphithéatre Marguerite Perey du Campus du CNRS à Cronenbourg
Soutenance de thèse de Azhar PIRZADO
"Integration of Few Layer Graphene Nanomaterials in Organic Solar Cells as (Transparent) Conductor Electrodes"

Jeudi 11 juin 2015 à 11h au Campus CNRS de Cronenbourg - Bat. 40 salle 40
Séminaire de Carmelo PIRRI , professeur à l'Institut de Science des Matériaux de Mulhouse (IS2M)
Un cristal bidimensionnel de germanium : le germanène

Friday 17 April at 13:30 dans l'amphithéâtre A301 à Télécom Physique Strasbourg - Illkirch
PhD defense of M. Raba
"Modélisation et simulation des réponses électriques de cellules solaires organique".

Cette thèse a été dirigée par le Prof. Anne-Sophie CORDAN et co-encadrée par Yann LEROY. Le jury est composé de :
M. HIRSCH Lionel, Directeur de recherches, Université de Bordeaux
M. SIMON Jean-Jacques, Maître de conférence HDR, Université d'Aix-Marseille
M. KLEIDER Jean-Paul, Directeur de recherches, Université Paris-Sud
M. HEISER Thomas, Professeur des Universités, Université de Strasbourg

La soutenance aura lieu le vendredi 17 avril à 13h30 dans l'amphithéâtre A301 à Télécom Physique Strasbourg - Illkirch. Elle sera suivie d'un pot à la cafétéria du bâtiment A auquel vous êtes amicalement conviés.

Summary: "The main objective of this work is to study bulk heterojunction organic solar cells with a specific two dimensional model that takes into account an intermediate state specific to organic materials. The model is solved numerically by a finite element software. After its validation, it is compared to two existing approaches in the literature. The large number of parameters needed to describe the complex charge generation mechanism requires a robust parameter extraction algorithm, based on the operation of Markov chains, in order to extract these physical parameters from experimental characterizations. The model and the parameter extraction method are then used to study the charge dissociation mechanism of a cell with a newly synthesized molecule. Finally, the temperature evolution of P3HT :PCBM solar cells are simulated and compared to experimental measurements."

Thursday 16 April at 15:30 en Salle 40, Bâtiment 40, Campus CNRS, Cronenbourg
Seminar by Dr. Lionel HIRSCH, Laboratoire de l'Intégration du Matériau au Système, Talence, France
"Physical behaviors of organic solar cells".

Abstract:
The aim of this talk is to present the main activities of the lab in the organic electronics field and focus on the physics of organic solar cells. Actually, we use the devices to study their working principles as well as the physics of organic semiconductors. Two examples will be presented. The first one deals with the charge recombination dynamics. We have probed the charge recombination dynamics from sub picosecond to millisecond and demonstrated that the transition between bimolecular and monomolecular recombination mechanisms in BHJ solar cells is driven by the residual doping level. The second one with the TiOx interlayer used in inverted structure. Inverted structures need interlayer to collect electrons though the ITO electrode. TiOx is widely used but cells need to be light activated to get optimal efficiency. Then, understanding working mechanisms of selective interfacial layers and the underlying energetics of the organic semiconductor/electrode interface is an issue of primary concern for improving organic solar cell technologies. TiOx interlayers are used here to tune the selectivity of the cathode contact to electrons by the controlled action of UV light. After 2 minutes of UV-light exposure the device is fully activated showing high fill factor (~60 %) and adequate efficiencies (~4 %). The S-shaped kink observed for deactivated titania interlayers completely disappears. Kelvin probe and capacitance studies have been carried out to determine the effect of UV on the TiOx interlayer.

Thursday 5 March at 2pm in amphithéâtre Marguerite Perey, sur le site de Cronenbourg
Soutenance de thèse de Rim Khelifi
"Synthèse par faisceaux d’ions de nanocristaux semi-conducteurs fonctionnels en technologie silicium".

Le jury est composé de:

-M. Daniel MATHIOT, Professeur, Université de Strasbourg, ICube, Directeur de thèse.

-Mme. Caroline BONAFOS, Directrice de Recherche, CNRS, CEMES (Toulouse), Rapporteur.

-M. Hervé RINNERT, Professeur, Université de Lorraine, IJL (Nancy), Rapporteur.

-M. Sébastien DUGUAY, Maître de Conférence, Université de Rouen, GPM, Examinateur.

-M. Fabrice GOURBILLEAU, Directeur de Recherche, CNRS, CIMAP - ENSICAEN (Caen), Examinateur.

-M. Dominique MULLER, Ingénieur de Recherche, CNRS, ICube (Strasbourg), Examinateur.


Ces travaux de recherche ont été dirigés par Daniel Mathiot et co-encadrés par Dominique Muller. Ils ont été réalisés au sein de l'équipe MaCEPV du laboratoire ICube à Strasbourg.

Thursday 15 January 2015 at 11am , salle 40 du batiment 40, 23 rue du Loess , Campus de Cronenbourg, STRASBOURG
MaCEPV seminar by Quentin RAFFY, IPHC
Cinétique de production du radical HO• en milieu aqueux sous irradiation alpha / proton pour une application en hadronthérapie

Monday 15 December 2014, at 11am , salle 40 du batiment 40, 23 rue du Loess , Campus de Cronenbourg, STRASBOURG
MaCEPV seminar by Prof. S Sundar Kumar Iyer
Increasing Efficiency in Organic Solar Cells and Modules

Thursday 27 November 2014 at 11am en salle des Séminaires, Bat 40, 23 rue du Loess , Campus de Cronenbourg, STRASBOURG
MaCEPV seminar by Jayanta Baral

Thursday 16 October 2014 at 2pm en salle des Séminaires, Bat 40, 23 rue du Loess , Campus de Cronenbourg, STRASBOURG
Seminar by I.V. Komissarov (ICube-MaCEPV, Université BSUIR Minsk)

"CATALYST-FREE DEPOSITION OF MULTILAYER GRAPHENE FILM ON MGO (111) SINGLE CRYSTAL AND QUARTZ BY Pulse Laser Deposition"

Summer school on inorganic photovoltaics – L’inscription est désormais ouverte!

La première École d’Été Internationale sur le Photovoltaïque Organique dans le Rhin-Supérieur, organisée par le consortium du projet Rhin-Solar, aura lieu du 1er au 4 septembre 2014 à Strasbourg, France

Cette école d’été contribue à la formation des jeunes chercheurs en proposant une série de cours qui couvrent tous les aspects du développement de nouveaux molécules organiques jusqu’à la production continue des modules organiques photovoltaïques.

L’inscription est ouverte!

Tuesday 1 July 2014 at 2pm, salle 40 du batiment 40 du Campus CNRS de Cronenbourg (23 rue du Loess)
Mesure et gestion des contaminants métalliques nobles dans l’industrie microélectronique avancée
PhD follow-up seminar (mi-parcours) by Marie Devita (CIFRE STMicroelectronics / CEA-LETI), directed by Prof. D. Mathiot

from 7 to 10 October 2014

Ibaf.jpg

The IBAF 2014 meeting, that brings together ion beam users, will take place in Obernai from 7 to 10 October 2014. The meeting will gather French physicists, biologists and experts in ion beam processes and accelerators.

Monday 14 April 2014, new associate researcher in the team
Ivan KOMISSAROV will be in our team until 15 October 2014 and will investigate with François Le Normand the formation of a layer of grapheme at the interface between Cu and MgO.

Wednesday 2 April 2014 at 11:00, salle de Conférences du batiment 40 du Campus CNRS de Cronenbourg (23 rue du Loess)
Temperature Dependence of Magnetic Properties of Carbon Nanotube - Based Nanocomposite with Low Content of Ferromagnetic Nanoparticles
Professor Serghej .L. Prischepa Telecommunication Department Belarusian State University of Informatics and RadioElectronics P. Brovka str. 6, Minsk 220013 BELARUS Tel. +375172932317

Abstract :
We investigated the magnetic hysteresis loops of CNT-based nanocomposite with very low concentration of catalytic ferromagnetic nanoparticles. Measurements were performed in a wide temperature range, from 2K up to 350K. Experimental data were analyzed within the random anisotropy model (RAM), which gives us the possibility to evaluate the micromagnetic parameters of the system. The law of the approach to saturation (LAS) revealed that, for correct description of the data the correlation function of the magnetic anisotropy axes should be taken into account. At that the obtained correlation functions depend on temperature revealing the influence of the carbon medium on the interparticle interaction. In particular, it was shown that the magnetic coherent anisotropy dominates for the low concentration of nanoparticles at low temperatures. While increasing both the nanoparticle concentration and the temperature the exchange interparticle interaction dominates diminishing essentially the coherent processes. The influence of the concentration becomes determining starting from some threshold values which leads to the dominant role of the exchange coupling in the whole temperature range.

Invited by Francois LE Normand

Friday 31st January 2014 at 2 P.M., Amphitheatre Matthias Grünewald, Building 25 of the Cronenbourg campus (23 rue du Loess)
PhD defense of Peter Lienerth
Elaboration and characterization of field-effect transistors based on organic molecular wires for chemical sensing applications
Thesis Committee:
- M. Thomas HEISER, Supervisor
- M. George MALLIARAS, Principal examiner
- M. Klaus LEIFER, Principal examiner
- Mme Françoise SEREIN-SPIRAU, Examiner
- M. Bernard DOUDIN, Examiner

Abstract:
Due to the weak van der Waals bonding between neighboring molecules charge transport in organic semiconductors is very sensitive to ambient gases. Polar analytes have been reported to decrease the mobility in organic field effect transistors (OFETs) allowing reliable and reproducible detection of known compounds. We found that the additional utilization of the hysteresis of the transfer characteristics creates individual response-patterns, improving the identification of different polar analytes. Measurements of the transient drain current were employed to gain insights into the underlying mechanisms of the hysteresis change.
To improve the understanding of the side-chain influences on the gas sensing performances polymers with different side chains were used as active material in OFETs for ethanol sensing. The differences in sensitivity were correlated to the results derived from various experimental techniques and allowed to draw consistent conclusions on the origin of the behavior.

Friday 20th December 2013, amphithéâtre Marguerite Perey, Cronenbourg site at 23 rue du Loess
PhD defense of Fabien Ehrhardt
Synthesis and caracterisation of silicon nanostructures in a silicon oxynitride matrix: application to photovoltaic solar cells
Thesis Committee:
- M. SLAOUI Abdelilah, Directeur de Recherche, ICube, Strasbourg, Directeur de thèse

- Mme BERBEZIER Isabelle, Directrice de Recherche, IM2NP, Marseille, Rapporteur

- M GOURBILLEAU Fabrice, Directeur de Recherche, CIMAP, Caen, Rapporteur

- Mme BONAFOS Caroline, Directrice de Recherche, CEMES, Toulouse, Examinateur

- M FERBLANTIER Gérald, Maître de conférences, ICube, Strasbourg, Examinateur

- M REHSPRINGER Jean Luc, Directeur de Recherche, IPCMS, Strasbourg, Examinateur

REACT project
REACT is a collaborative project between the MaCEPV team at ICube and YURIC (Regional Innovation Center for Solar Cells and Module) at YEUNGNAM University (South Korea). The project duration is two years (2013-2014).
The projects is targeting to: control the synthesis of ZnO films doped with rare earth elements (RE-TCO), understand the influence of doping processes on the optical and electrical properties of such an oxide, implement such films on silicon and CIGS solar cells, and test their performances. The project is based on the exchange of students, researchers, samples and caracterisation techniques.

The European EUROSUNMED project - in which the MaCEPV team is a major actor (coordination)- was launched in Brussels on 4 September 2013.

EUROSUNMED is a 4-year collaborative project supported by the FP7 Programme. It gathers research centres, university laboratories, national agencies and SMSs from Europe and MPC (Mediterranean Partners countries), namely Morocco and Egypt. This innovative project is targeting the following objectives:

· Developing new technologies in 3 energy field areas, namely photovoltaics, concentrated solar power and grid integration;

· Testing innovative components (PV cells/modules, heliostats…) under specific conditions of MPCs (irradiation, hot climate, dust…);

· Establishing a strong network between EU and MPCs through exchange of students, senior researchers/engineers for transferring knowledge and technologies;

· Disseminating the results of the project through the organization of scientific events open to a large public from universities, engineering schools and stakeholders;

Coordinator: A. Slaoui (MaCEPV, ICube)
Website: http://www.eurosunmed.eu
Newsletter: http://www.eurosunmed.eu/simplenews/eurosunmed-newsletter-ndeg1

Wednesday 20th November 2013 – Hotel Mittenza – Basel
“Research and Industry Forum on Organic Photovoltaics” on the theme:

Inkjet printing and roll-to-roll processes for organic solar cells

organised by the consortium Rh(e)in-Solar


The Rh(e)in-Solar R&I forum allows industrial and academic actors from the OPV technology to meet and present the latest developments in inkjet printing and roll-to-roll processing. Key speakers from Switzerland, Great-Britain and France as well as members from the Rh(e)in-Solar consortium will expose their work and take part in a debate about perspectives for industrial developments of this emerging technology. Two representatives of the European funding agencies are also invited to present the Interreg V and Horizon 2020 programs and to identify opportunities for supporting R&D activities in OPV.

For more information about the forum and the Rh(e)in-Solar consortium, please visit our website www.rhinsolar.eu Registration to the forum is free but compulsory before November 13th. Please find the registration form at the following link: http://www.pole.energivie.eu/formulaire/inscription-evenement?id_event=491&nom=Forum+Recherche+Industrie+-+Rh%28e%29in+Solar

Wednesday 13 November, room 25 building 40
Visit of researchers from Fraunhofer ISE, Structured Surfaces group
11:00 Dr B. Bläsi: Photonic Micro and Nanostructures (30+15 min)
11:45 Dipl. Phys. S. Jüchter: Plasmonic Particle Arrays for Photon Management (30+15 min)

Friday 4 October at 10:30 en Salle 40 du Bâtiment 40
Nanocristaux semi-conducteurs de type CdS et ZnO : une approche pluridisciplinaire

Mathieu Frégnaux
Laboratoire Réactions et Génie des Procédés (LRGP, UMR 7274) Ecole Nationale Supérieure des Industries Chimiques (ENSIC) Université de Lorraine, Nancy, France

RESUME:

Des nanocristaux semi-conducteurs (quantum dots – QD) de type II-VI (CdS et ZnO) ont été élaborés par différentes méthodes chimiques relevant de l’approche bottom-up : les croissances (i) par source unique de précurseur et (ii) par voie micro-ondes pour CdS mais aussi (iii) par voie sol-gel pour ZnO. Dans les trois cas, l’utilisation de basses températures de croissance (T < 280°C) mais également le recours à des temps de réactions très courts (5 min <t < 2h) ont permis l'obtention de QD de petites tailles, 2 nm < Ø < 6 nm.

Dans le but d’étudier les propriétés physiques et chimiques des QD de CdS, un protocole de caractérisation par techniques conjointes a été mis au point. La spectrométrie de masse (SM) couplée à des sources d’ionisation douce (MALDI-TOF MS) a permis d’estimer la taille et la distribution en taille des QD. Ces estimations ont été confirmées par microscopie électronique en transmission (MET). La confrontation des résultats de SM et de MET a suggéré une géométrie des QD (i) sphérique et (ii) ellipsoïdale. La diffraction des rayons X (DRX) a montré l’état cristallin des nanoparticules en structures (i) würtzite et (ii) zinc blende. La spectroscopie optique à température ambiante (absorption et photoluminescence – PL) a témoigné des effets de confinement quantique par le glissement de la réponse excitonique en fonction de la taille des QD, tout en s’inscrivant dans la correspondance connue énergie-taille. Dans la perspective d'applications optoélectroniques potentielles, le transfert de ces solutions colloïdales en couches minces est primordial. Ainsi, le développement de dépôt de couches minces de polymère (PMMA) contenant des QD par spin coating a été développé. Les différentes techniques de caractérisation ont montré que les QD conservaient leur intégrité et leurs propriétés de luminescence lors de leur inclusion dans la couche de PMMA. Le recours à la microscopie électronique à balayage (MEB) couplée à une analyse aux rayons X a permis de connaître la composition chimique des dépôts et la MET en haute résolution (METHR) nous a renseigné sur la structure cristalline des nanoparticules. Une étude par ellipsométrie spectroscopique a été entreprise pour cerner plus directement les propriétés optiques de ces couches minces nanostructurées.

Enfin, les QD de ZnO synthétisés (iii) par voie sol-gel ont été fonctionnalisés par des (poly)aminoalkoxysilanes pour les rendre hydrodispersables et biocompatibles. L’évaluation des risques associés à ce type de nanomatériaux nécessite de mettre en évidence une relation entre propriétés physiques, chimiques et toxicité. Dans le cas des nanocristaux, la toxicité semble avoir au moins deux origines : une fuite de métal du cœur du QD et la production d'espèces réactives de l'oxygène (radicaux). Si la fuite de métal est liée à la composition et à la stabilité des QD, la production d’espèces réactives de l’oxygène semble être liée à sa réactivité et sa chimie de surface.

Vendredi 20 Septembre à 11h00, en Salle 40 du Batiment 40
Présentation du travail de Master 2 de Mohammed Benyahia

Croissance de films monocristallins de nickel sur MgO(111). Application à la formation de graphène par implantation de carbone et recuit.

Friday 6 September, at 10h30, salle 40 du Bt. 40 (campus de Cronenbourg).
Seminar (suivi de thèse) by Rim Khelifi

Synthèse par faisceaux d'ions de nanocristaux semi-conducteurs fonctionnels en technologie silicium

Tuesday 23 July, Symposium related to the European mobilty contract "Belera" at Campus de Cronenbourg, Bâtiment 40, Salle 40

« Magnetic properties of hybrid carbon nanotubes-ferromagnetic materials »

Programme

  • 09h30 Coffee and Welcome
Morning Moderator : W. Labunov (BSUIR University, Minsk, Belarus)
  • 09h45 Prof Serghej Prischepa (BSUIR University, Minsk, Belarus)
"Interplay between exchange coupling and magnetic anisotropy in aligned arrays of CNT with iron based magnetic nanoparticles"
  • 10h30 Dr Francois Le Normand (CNRS/ICube-MaCEPV, Strasbourg, France)
« Magnetic properties of ferromagnetic nanoparticles encapsulated on top of oriented carbon nanotubes by plasma-enhanced CVD »
  • 11h15 Break
  • 11h30 Dr Alena Prudnikava (BSUIR University, Minsk, Belarus)
"Structural characterization of CNTs synthesized by floating catalyst CVD at different conditions".
Afternoon Moderator : S. Prischepa (BSUIR University, Minsk, Belarus)
  • 14h00 Prof Luc Hébrard (CNRS/ICube-SMH, Strasbourg, France)
"CMOS compatible integrated magnetometers"
  • 14h40 Dr Ivan Komissarov (BSUIR University, Minsk, Belarus)
« to be completed «
  • 15h30 Prof. Andrzej Wisniewski (Division of Magnetism, Institute of Physics, Polish Academy of Sciences, Warsaw, Poland
« Tunable magnetic properties of cobaltite nanoparticles »
  • 16h15 Conclusions and Perspectives

Monday 22nd July 2013 at 11 am at the auditorium of the IPCMS

Seminar Rh(e)in-Solar : Tandem architectures for efficient organic solar cells

presented by
Dr. Alexander COLSMANN
Light Technology Institute, Karlsruhe Institute of Technology (KIT), Engesserstrasse 13, 76131 Karlsruhe, Germany

Abstract: Very recently, a number of companies announced organic solar cells with power conversion efficiencies well exceeding 10% on lab scale opening pathway towards a cost-efficient exploitation of this young technology, thereby widely exhausting the efficiency potential for common single junction solar cells. Reasons for the strong efficiency limitations in organic solar cells are among others the spectrally limited absorption of organic semiconductors as well as thermalization losses during charge carrier relaxation after the absorption of highly energetic photons. A widely discussed concept to overcome this limitation is the use of tandem solar cell architectures, i.e. the (monolithic) integration of two solar cells in series in a single device stack. Their working principle relies on two different light absorbing semiconductors with different band-gap and hence complementary absorption in order to ensure a broader absorption of the solar spectrum and to reduce the energy losses upon the absorption of highly energetic photons. In fabrication processes, the sophisticated tandem solar cell multilayer-architectures offer many degrees of freedom such as choices for materials and layer thicknesses. Hence, understanding their working principle and optimizing their efficiency is one of the most challenging tasks in organic photovoltaics. Besides carefully chosen complementary absorbers there is a strong need for charge carrier transport layers that allow for the fabrication on an ohmic intermediate contact with low resistivity. Both require advanced solutions in particular when low-cost solution deposition processes are considered with respect to future printing processes.

In this work we present general concepts for the solution fabrication of tandem organic solar cells and how to realize devices with decent power conversion efficiencies. In particular, we present promising concepts for charge carrier transport layers for advanced device architectures and solutions how to overcome solubility limitations.

Thursday 11 July at 10:30, salle 70, IPCMS

Seminar Phase Evolution during the Selenization of CuGaIn Alloy Precursors presented by
Pr Woo Kyoung Kim, School of Chemical Engineering, Yeungnam University, South Korea

Wednesday 10 July 2013
STAR program France-Korea with Yeungnam University: some MaCEPV members visit Voltec-solar

Visite-voltec.jpg

Wednesday 10 July at 11am; Auditorium IPCMS

Seminar Research Activities at Information Materials Laboratory of Yeungnam University, South Korea

presented by
Pr Chinho PARK, Regional Innovation Center for Solar Cell & Module (YURIC), Yeungnam University, South Korea

2nd July at 10.30 AM in room 40 of building 40 (CNRS Campus in Cronenbourg)

Seminar Étude de l’intégration de vias traversants réalisés par MOCVD en vue de l’empilement 3D de composants microélectroniques

Presented by
Larissa DJOMENI, PhD student at Icube

21 Juin à 14h en Salle 40 du bâtiment 40 (Campus CNRS Cronenbourg)

Séminaire Étude par Microscopie Electronique à Transmission quantitative de nanocristaux enrobés dans des diélectriques

présenté par

C. Bonafos, C. Gatel, E. Snoeck et M. J. Hÿtch

CEMES/CNRS, 29 rue J. Marvig, 31055 Toulouse Cedex 04

Abstract

Les nanocristaux semiconducteurs ou métalliques élaborés par des techniques dites « physiques » (implantation ionique, pulvérisation cathodique ou dépôt chimique en phase vapeur…) et enrobés dans des matrices diélectriques sont étudiés pour leurs propriétés électroniques et/ou optiques. Ces systèmes nanostructurés sont intéressants pour des applications (i) en photonique (dispositifs électroluminescents, guides d’ondes), en mettant à profit les effets de confinement quantique dans les nanostructures semiconductrices [1], en plasmonique en profitant de l’exaltation du champ électromagnétique grâce aux plasmons de surface des nanocristaux métalliques [2] et, pour les deux types de nanocristaux, en microélectronique (mémoires non volatiles) en profitant de leurs propriétés de stockage de charge [3], voire même en photovoltaïque. Dans cette conférence, nous nous intéresserons aux propriétés structurales de ces nanocristaux et en particulier aux techniques de Microscopie Electronique à Transmission avancées permettant une étude quantitative sur des populations ou d’un nanocristal isolé. Le cas particulier de nanocristaux de Si enrobés dans des matrices de silice ou de nitrure de silicium sera étudié, et nous montrerons tout l’intérêt de l’imagerie filtrée en énergie (EFTEM) pour une étude quantitative complète de ces systèmes [4]. Ensuite, deux techniques développées au CEMES et permettant la cartographie de contraintes via des mesures de déformations (l’analyse des phases géométriques [5] et l’holographie en champ sombre [6]) seront présentées. Nous montrerons les premiers résultats concernant l’état de contrainte de nanocristaux d’Ag individuels enrobés dans de la silice ainsi que l’intérêt de telles mesures pour comprendre les propriétés vibrationnelles de ces objets d’une part et leurs processus d’auto-organisation d’autre part.

[1] J. Carreras, C Bonafos, J Montserrat, C Dominguez, J Arbiol and B Garrido Nanotechnology, 19, 205201 (2008).

[2] R. Carles, C. Farcau, C. Bonafos, G. Benassayag, M. Bayle, P. Benzo, J. Groenen, and A. Zwick ACS Nano, 5 (11), pp 8774–8782 (2011).

[3] C. Bonafos, M. Carrada, G. Ben Assayag, A. Slaoui, P. Dimitrakis and P. Normand, Materials Science in Semiconductor Processing, article de revue, (Ed. Elsevier), 15, 615–626 (2012).

[4] S. Schamm, C. Bonafos, H. Coffin, N. Cherkashin, M. Carrada, G. Ben Assayag, A. Claverie, M. Tencé, C. Colliex, Ultramicroscopy 108, 346–357 (2008).

[5] M.J. Hÿtch, E. Snoeck and R. Kilaas, Ultramicroscopy 74, 131–146(1998).

[6] M.J.Hÿtch, F.Houdellier, F.Hüe and E.Snoeck, Nature 453 1086 (2008)

Wednesday 12/06/2013 at 11:00 am
Integration of Few Layer Graphene (FLG) nanomaterial as transparent conductive electrode (TCE) in Organic Photovoltaic (OPV) cells

Presenter: PIRZADO Azhar Ali Ayaz

Location: Room no: 25, Building 40 Cronenbourg Campus

20 Mars à 14h en Salle 40 du bâtiment 40 (Campus CNRS Cronenbourg)
A 10-nm sized molecular electronics platform for applied and fundamental molecular property measurements

Séminaire présenté par

KLAUS LEIFER Departement of Engineering Science, University of Uppsala, Sweden.

Abstract

The field of single and few molecule electronics has seen great progress in electrical contacting of molecules, chemical protocols and measurement set-ups. Here, we show a new way to establish molecular-metal junctions in a nanoelectrode-molecule-nanoparticle junction platform [1]. The device allows for measurements of electrical properties of a few molecules which is a sufficiently small number to obtain the electronic signature related to single molecules bound in this junction. The molecule-nanoparticle junctions are established by di-electrophoretic trapping of octane-dithiol functionalised nanoparticles (5nm), where the dangling thiol group is protected using trityl molecules [2]. The subsequent removal of the trityl molecules allows the thiol-group to bond to the closest metal surface so that a network of conductive pathways is established between the electrodes spaced by 20nm. This procedure enabled the establishment of reproducible molecule-metal junctions resulting in the reduction of the spread of resistance histograms on the devices to less than one order of magnitude. This enabled us to carry out inelastic tunnel spectroscopy (IETS) measurements. Quantitative modelling of these junctions by density functional theory calculations as well as quantum transport calculations allowed very good fits of the model to our experimental results revealing several vibrational transitions in the IETS spectra. Furthermore we obtain that typical conductive channels contain 4-6 molecule-nanoparticle junctions. This platform is thus prepared for sensor applications and we will present first sensing results.


[1] T. Blom, K. Welch, M. Stromme, E. Coronel, K. Leifer, Nanotechn. 18, 285301, 2007; S. H. M. Jafri, T. Blom, A. Wallner, K. Welch, M. Stromme, H. Ottosson and K. Leifer, J. Microelectr. Eng., 88, 2629, 2011.

[2] A. Wallner,H.Jafri,T.Blom,A.Gogol,J.Baumgartner,K.Leifer,H.Ottosson,Langmuir27,9057,2011.

Lundi 4 février à 11h en Salle 40 du bâtiment 40 (Campus CNRS Cronenbourg), séminaire du département DESSP-ICUBE présenté par

Olivier SIMONETTI de l'Université de Reims Champagne-Ardenne, ­Laboratoire de Recherche en Nanosciences.

Titre du séminaire : Modélisation du transistor organique : Prise en compte du transport et de l’injection des charges

Résumé :

Les propriétés électriques et optiques de différents matériaux organiques ont permis la démonstration d’un certain nombre de dispositifs opto-électroniques : diodes organiques électroluminescentes (OLED), transistors organiques (OFET), cellules solaires (OPV) ... . Des technologies bas coût, à l’instar de l’impression jet d’encre, sont en développement pour produire ces dispositifs à grande échelle et sur substrats souples (« roll to roll »). Le nombre d’applications envisagées est énorme, les plus fréquemment citées étant les écrans souples, les étiquettes RFID, les capteurs ... ; le domaine de l’électronique organique, multidisciplinaire, est en essor rapide dans le monde entier. Toutefois, si des écrans OLED sont disponibles commercialement, une des briques fondamentales des circuits électroniques, le transistor, n’est pas encore mature pour les applications envisagées. Malgré des améliorations significatives ces 20 dernières années, les OFETs souffrent de nombreux défauts : tensions de polarisation élevées, courants faibles, fréquences très limitées, instabilités et dérives ... . Ces nombreux verrous technologiques sont en partie dus à des limitations intrinsèques des matériaux organiques, notamment les phénomènes liés au transport et à l’injection des porteurs de charge dans les composants organiques qui ne sont pas encore totalement compris. Cependant, des modèles physiques avancés de transport et d’injection ont été développés sur la base d’hypothèses relatives au caractère désordonné des semi-conducteurs organiques. Même si ces modèles peuvent poser encore question ils permettent de rendre compte d’un grand nombre de comportements physiques observés dans les dispositifs électroniques organiques (en température, en champ ...).

Nos études se concentrent sur l’étude du comportement électrique du transistor organique et sa réalisation par impression. Après un survol de l’électronique organique nous présenterons le transistor organique, ses limitations et les moyens techniques nous permettant de le caractériser. Nous exposerons ensuite les résultats obtenus sur la réalisation d’un transistor organique où le semi-conducteur a été déposé par impression jet d’encre (voir la figure). Nous nous focaliserons enfin sur un modèle électrique d’OFET prenant en compte les phénomènes physiques spécifiques des matériaux organiques. Nous montrerons les implications qui découlent de la prise en compte de ces phénomènes physiques sur le comportement des transistors organiques. Ce modèle, accessible en ligne, prend en compte le transport par saut, l’injection non linéaire aux contacts, des pièges à l’interface isolant/semi-conducteur, des résistances de contact au niveau des électrodes source et drain, fixes et/ou dépendantes de la polarisation, etc.

Jeudi 31 janvier 2013 à 11h en Salle 40 du bâtiment 4 (Campus CNRS Cronenbourg), séminaire DESSP-MACEPV présenté par

Daniel BELLET du Laboratoire des Matériaux et du Génie Physique (LMGP) de Grenoble

Titre du séminaire : Quelques problèmes physiques relatifs aux électrodes transparentes (notamment en vue d’intégration de cellules solaires)

Résumé :

Les matériaux transparents conducteurs (TCM) font l’objet de nombreuses études scientifiques et technologiques. Le but applicatif de ces électrodes transparentes concernent des domaines d’applications dont les besoins industriels vont aller croissant à l’avenir du fait de leurs utilisations indispensables au sein de cellules solaires, d’écrans ou éclairage de basse consommation (LEDs) etc… Deux grandes familles coexistent au sein des TCM : les oxydes transparents conducteurs (TCO) et des matériaux plus récemment étudiés. Parmi ces derniers, les réseaux de nanofils métalliques semblent être très prometteurs, tant en terme de propriétés physiques, mécanique que sur le plan économique. Nous discuterons de divers processus qui limitent les propriétés physiques de ces matériaux.