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Matthieu Despeisse

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Publications associées (77)

High-efficiency microcrystalline silicon single-junction solar cells

Christophe Ballif, Gaetano Parascandolo, Grégory Bugnon, Mathieu Gérard Boccard, Matthieu Despeisse, Jordi Escarre Palou, Simon Hänni

This short communication highlights our latest results towards high-efficiency microcrystalline silicon single-junction solar cells. By combining adequate cell design with high-quality material, a new world record efficiency was achieved for single-junctio ...

Wiley-Blackwell2013

Light Harvesting Schemes for High Efficiency Thin Film Silicon Solar Cells

Christophe Ballif, Mathieu Charrière, Peter Cuony, Gaetano Parascandolo, Laura Ding, Sylvain Nicolay, Grégory Bugnon, Mathieu Gérard Boccard, Matthieu Despeisse, Corsin Battaglia, Jordi Escarre Palou, Michael Elias Stückelberger, Maximilien Joseph Marie Bonnet-Eymard

In Thin Film Silicon (TF-Si) solar cells light harvesting schemes must guarantee an efficient light trapping in the thin absorber layers without decreasing the silicon layers quality and consecutively the p-i-n diodes electrical performance. TF-Si solar ce ...

Ieee2012

Light trapping in solar cells: can periodic beat random?

Christophe Ballif, Marco Cantoni, Mathieu Charrière, Karin Söderström, Duncan Thomas Lindsay Alexander, Franz-Josef Haug, Mathieu Gérard Boccard, Matthieu Despeisse, Corsin Battaglia, Jordi Escarre Palou

Theory predicts that periodic photonic nanostructures should outperform their random counterparts in trapping light in solar cells. However, the current certified world-record conversion efficiency for amorphous silicon thin-film solar cells, which strongl ...

2012

Time evolution of surface defect states in hydrogenated amorphous silicon studied by photothermal and photocurrent spectroscopy and optical simulation

Christophe Ballif, Matthieu Despeisse, Michael Elias Stückelberger, Jakub Holovsky

The time evolution of surface defect density and width of space charge region in thin layer of amorphous silicon is observed experimentally by Fourier transform photocurrent spectroscopy. This work reviews the assumption that photocurrent is insensitive to ...

Elsevier Science Bv2012

Highly transparent ZnO bilayers by LP-MOCVD as front electrodes for thin-film micromorph silicon solar cells

Christophe Ballif, Laura Ding, Sylvain Nicolay, Grégory Bugnon, Mathieu Gérard Boccard, Matthieu Despeisse, Mustapha Benkhaira

ZnO bilayer films were deposited by a low-pressure metalorganic chemical vapor deposition technique in a single process step, by doping with boron only the nucleation stage of the growth. The resulting 2 pm thick layers are characterized by low free carrie ...

Elsevier2012

Geometric light trapping for high efficiency thin film silicon solar cells

Christophe Ballif, Laura Ding, Sylvain Nicolay, Grégory Bugnon, Franz-Josef Haug, Matthieu Despeisse, Corsin Battaglia, Jordi Escarre Palou

The imprinting of random square based pyramidal textures with micrometric scale at the air/glass interface of thin film silicon solar cells is presented as an efficient alternative to anti-reflective coatings to minimize reflection losses at the cell entra ...

Elsevier2012

Multiple-junction photoelectric device and its production process

Christophe Ballif, Peter Cuony, Gaetano Parascandolo, Matthieu Despeisse

The present invention relates to a multiple-junction photoelectric device comprising, in sequence, a substrate (4), a first conducting layer (2), at least two elementary photoelectric devices (6, 10), at least one of said elementary photoelectric devices ( ...

2012

A New View of Microcrystalline Silicon: The Role of Plasma Processing in Achieving a Dense and Stable Absorber Material for Photovoltaic Applications

Christophe Ballif, Thomas Söderström, Peter Cuony, Gaetano Parascandolo, Grégory Bugnon, Matthieu Despeisse, Jakub Holovsky, Simon Hänni

To further lower production costs and increase conversion efficiency of thin-film silicon solar modules, challenges are the deposition of high-quality microcrystalline silicon (μc-Si:H) at an increased rate and on textured substrates that guarantee efficie ...

2012

LPCVD ZnO-based intermediate reflector for micromorph tandem solar cells

Christophe Ballif, Thomas Söderström, Laura Ding, Sylvain Nicolay, Grégory Bugnon, Matthieu Despeisse

The use of zinc oxide (ZnO) based intermediate reflector (ZIR) in micromorph solar cells using low pressure chemical vapor deposition (LPCVD) was investigated. The influences of deposition temperature and dopant gas concentration on grain size and lateral ...

2011

Resistive interlayer for improved performance of thin film silicon solar cells on highly textured substrate

Christophe Ballif, Andrea Feltrin, Peter Cuony, Grégory Bugnon, Adrian Billet, Matthieu Despeisse, Michael Elias Stückelberger

The deposition of thin-film silicon solar cells on highly textured substrates results in improved light trapping in the cell. However, the growth of silicon layers on rough substrates can often lead to undesired current drains, degrading performance and re ...

AIP American Institute of Physics2010

ZnO Transparent conductive oxide for thin film silicon solar cells

Christophe Ballif, Sylvie Faÿ, Thomas Söderström, Andrea Feltrin, Peter Cuony, Sylvain Nicolay, Grégory Bugnon, Franz-Josef Haug, Mathieu Gérard Boccard, Matthieu Despeisse

There is general agreement that the future production of electric energy has to be renewable and sustainable in the long term. Photovoltaic (PV) is booming with more than 7GW produced in 2008 and will therefore play an important role in the future electric ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2010

Micro-Channel Plate Detectors Based on Hydrogenated Amorphous Silicon

Christophe Ballif, Sylvain Dunand, Matthieu Despeisse, François Eric Powolny

A new type of micro-channel plate detector based on hydrogenated amorphous silicon is proposed which overcomes the fabrication and performance issues of glass or bulk silicon ones. This new type of detectors consists in 80-100 μm thick layers of amorphous ...

2010

Research and developments in thin film silicon photovoltaics

Christophe Ballif, Sylvie Faÿ, Martin Python, Thomas Söderström, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon, Franz-Josef Haug, Matthieu Despeisse

The increasing demand for photovoltaic devices and the associated crystalline silicon feedstock demand scenario have led in the past years to the fast growth of the thin film silicon industry. The high potential for cost reduction and the suitability for b ...

2009

Time based readout of a silicon photomultiplier (SiPM) for Time Of Flight Positron Emission Tomography (TOF-PET)

Thierry Meyer, Matthieu Despeisse, François Eric Powolny

Time of flight (TOF) measurements in positron emission tomography (PET) are very challenging in terms of timing performance, and should achieve ideally less than 100ps FWHM precision. We present a time-based differential technique to read out SiPMs that ha ...

2009

Development of Micromorph Cells in Large-Area Industrial Reactor

Christophe Ballif, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon, Adrian Billet, Matthieu Despeisse

The influences of the deposition pressure and silane depletion on the efficiency of single-junction microcrystalline silicon solar cells has been investigated. The efficiency is found to correlate with the ion energy which affects the density of states in ...

2009

Low noise, low power front end electronics for pixelized TFA sensors

Christophe Ballif, Matthieu Despeisse

Thin Film on ASIC (TFA) technology combines advantages of two commonly used pixel imaging detectors, namely, Monolithic Active Pixels (MAPs) and Hybrid Pixel detectors. Thanks to direct deposition of a hydrogenated amorphous silicon (a- Si:H) sensor lm on ...

2009

LATEST DEVELOPMENTS ON MICROMORPH TANDEM CELLS AT IMT

Christophe Ballif, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon, Matthieu Despeisse

The latest developments on micromorph tandem cells in small area laboratory and large area industrial PE-CVD systems are reviewed. We report on a 13.3% initial efficiency micromorph tandem cell deposited in our small area system. The development of an in-s ...

2009

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