Stephane Collin
Office National d'Études et de Recherches Aérospatiales
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Publication
Featured researches published by Stephane Collin.
Archive | 2017
Juan Castro Arias; Andrea Cattoni; D. Decanini; Stephane Collin; Anne-Marie Haghiri-Gosnet
Arrays of plasmonic nanocavities with very low volumes, down to λ3/1000, have been fabricated by soft UV nanoimprint lithography. It leads to high refractive index sensitivity (368 nm/RIU) and figure of merit (∼46) and offers new perspectives for efficient biosensing experiments in ultralow volumes.
IEEE Journal of Photovoltaics | 2014
Myriam Paire; C. Jean; Laurent Lombez; Tarik Sidali; Aurelien Duchatelet; E. Chassaing; Gregory Savidand; Frédérique Donsanti; Marie Jubault; Stephane Collin; Jean-Luc Pelouard; Daniel Lincot; Jean-François Guillemoles
We present a new Cu(In,Ga)Se2 characterization tool: Cu(In,Ga)Se2 microcells. By creating pixels on a Cu(In,Ga)Se2 substrate, we are able to test electrically different locations. Moreover, because of the reduced size of the cells, (5-to 500-μm wide), heat and spreading resistance losses are made negligible, which make high flux characterizations available. We analyze current-voltage curves under high concentration to gain insight in the physical properties of Cu(In,Ga)Se2 cells. From our analysis, Cu(In,Ga)Se2 electrodeposited absorbers present resistivity fluctuations that are much more important than co-evaporated ones. These absorbers, as they present more electronic defects, are also more affected by the Voc increase under intense fluxes, and the efficiency gains can be very significant: up to 6% absolute efficiency points at less than 50 suns.
Physics, Simulation, and Photonic Engineering of Photovoltaic Devices VII | 2018
M. Tchernycheva; Valerio Piazza; Himwas Chalermchai; Omar Saket; Marco Vettori; Ahmed Ali; Francois H. Julien; Nicolas Chauvin; Philippe Regreny; Alain Fave; M. Gendry; G. Patriarche; Pierre Rale; Fabrice Oehler; Stephane Collin; Jean-Chirstophe Harmand
The record in photovoltaic conversion efficiency is detained by multi-junction solar cells based on III-V semiconductors. However, the wide adoption of these devices is hindered by their high production cost, to a large extent due to the expensive III-V substrates. As an alternative, a hybrid geometry has been proposed [LaPierre JAP 2011], which combines a 2D Si bottom cell with a III-V nanowire top cell in a tandem device. This approach, which may reach theoretical efficiencies of approx. 34%, requires smaller amounts of expensive III-V materials compared to conventional III-V tandem cells and benefits from the nanowire light trapping effects. nnIn this work, we report the fabrication and nanoscale characterization of two types of nanostructures for solar cells: radial GaAlAs and axial GaAsP p-n junction nanowires. Nanowires are grown by gallium-assisted molecular beam epitaxy using Be and Si as doping sources. The composition (probed by EDX and cathodoluminescence) was adjusted to tune the bandgap toward the optimal value for a III-V-on-Si tandem cell (approx. 1.7 eV). Local I-V characteristics and electron beam induced current (EBIC) microscopy under different biases are used to probe the electrical properties and the generation pattern of individual nanowires. For radial junction nanowires, EBIC mappings revealed a homogeneous collection of carriers on the entire nanowire length. For axial junction nanowires, the doping concentrations and the minority carrier diffusion lengths were extracted from the EBIC generation profiles. The effect of an epitaxial GaP passivating shell on the optical and generation properties was assessed.
Optical Nanostructures and Advanced Materials for Photovoltaics | 2017
Andrea Cattoni; Andrea Scaccabarozzi; Hung-Ling Chen; Fabrice Oehler; Chalermchai Himwas; G. Patriarche; M. Tchernycheva; J. C. Harmand; Stephane Collin
We present key achievements for the realization of nanowire-based III-V/Si tandem solar cells: nearly perfect (99%) arrays of vertical GaAs1−XP nanowires on Si over large surfaces, and a method to determine their doping level at the nanoscale.
Advanced Photonics & Renewable Energy (2010), paper PWC2 | 2010
Stephane Collin; Fabrice Pardo; Nathalie Bardou; Jean-Luc Pelouard
We propose new concepts for light trapping in ultra-thin solar cells. It is shown that optical nanoantennas can lead to broadband absorption in 30nnm-thick GaAs solar cells, with 14.5% energy conversion efficiency.
Archive | 2012
Charlie Koechlin; Patrick Bouchon; Riad Haïdar; Jean-Luc Pelouard; Jean-Jacques Yon; Joël Deschamps; Fabrice Pardo; Stephane Collin
Archive | 2003
Fabrice Pardo; Stephane Collin; Jean-Luc Pelouard
Archive | 2011
Stephane Collin; Anne-Marie Haghiri-Gosnet; Philippe Lalanne; Fabrice Pardo; Jean-Luc Pelouard; Christophe Sauvan
Archive | 2011
Stephane Collin; Jean-Luc Pelouard; Fabrice Pardo; Anne-Marie Haghiri-Gosnet; Philippe Lalanne; Christophe Sauvan
Archive | 2011
Grégory Vincent; Riad Haïdar; Stephane Collin; Jean-Luc Pelouard