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Mathieu Gérard Boccard

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Publications associées (80)

Hybrid sequential deposition process for fully textured perovskite/silicon tandem solar cells

Christophe Ballif, Laura Ding, Sylvain Nicolay, Quentin Thomas Jeangros, Soo-Jin Moon, Arnaud Walter, Davide Sacchetto, Mathieu Gérard Boccard, Matthieu Despeisse, Jérémie Werner, Florent Sahli, Loris Barraud, Raphaël Monnard, Monica Morales Masis, Gianluca Cattaneo, Bertrand Yves Paul Paviet-Salomon, Björn Niesen, Gizem Nogay, Oscar Esteban Rucavado Leandro, Matthias Wolfgang Bräuninger, Peter Joseph Fiala, Chien-Jen Yang, Fan Fu

Tandem solar cells that feature a high-bandgap perovskite cell on top of a lower bandgap silicon cell have the potential to reach efficiencies > 30%. Here, we present a versatile hybrid deposition method that yields conformal perovskite cells directly on t ...

IEEE2018

Comparison of amorphous silicon absorber materials: Kinetics of light-induced degradation

Christophe Ballif, Adrian Billet, Franz-Josef Haug, Mathieu Gérard Boccard, Matthieu Despeisse, Michael Elias Stückelberger, Yannick Samuel Riesen

We investigate the influence of the deposition parameters for intrinsic amorphous silicon absorber layers on light-induced degradation (LID) of thin-film silicon solar cells. The focus is on absorber layers with different bandgaps: on one side, solar cells ...

Wiley-Blackwell2016

A scalable and inexpensive surface-texturization method for advanced transparent front electrodes in microcrystalline and micromorph thin film silicon solar cells

Christophe Ballif, Franz-Josef Haug, Mathieu Gérard Boccard, Nils Linus Löfgren, Julien Claude Bailat, Yang Wang

As the thin film silicon solar cell technology reaches a pivotal point to keep competing in the photovoltaic industry where crystalline silicon and other technologies currently dominate, it has become an urgent task to revolutionize some of its state-of-th ...

Wiley-VCH Verlag2015

Light trapping in solar cells: numerical modeling with measured surface textures

Christophe Ballif, Franz-Josef Haug, Mathieu Gérard Boccard, Thomas Andreas Lanz, Beat Ruhstaller

We present and experimentally validate a computational model for the light propagation in thin-film solar cells that integrates non-paraxial scalar diffraction theory with non-sequential ray-tracing. The model allows computing the spectral layer absorbance ...

Optical Society of America2015

Amorphous silicon-germanium for triple and quadruple junction thin-film silicon based solar cells

Christophe Ballif, Grégory Bugnon, Franz-Josef Haug, Mathieu Gérard Boccard, Matthieu Despeisse, Michael Elias Stückelberger, Maximilien Joseph Marie Bonnet-Eymard, Björn Niesen

We study amorphous silicon-germanium (a-SiGe:H) as intrinsic absorber material for thin-film silicon-based triple and quadruple junction solar cells. First, we present the development of a-SiGe:H single junction devices, in particular the Ge-content gradin ...

Elsevier2015

Silver versus white sheet as a back reflector for microcrystalline silicon solar cells deposited on LPCVD-ZnO electrodes of various textures

Christophe Ballif, Franz-Josef Haug, Mathieu Gérard Boccard, Etienne Antoine Julien Moulin

We compare the performance of two back reflector designs on the optoelectrical properties of microcrystalline silicon solar cells. The first one consists of a 5-mu m-thick low-pressure chemical vapor deposition (LPCVD)-ZnO electrode combined with a white s ...

Wiley-Blackwell2015

Micromorph silicon solar cell optical performance: Influence of intermediate reflector and front electrode surface texture

Franz-Josef Haug, Mathieu Gérard Boccard

The optical performance of tandem a-Si:H/mu c-Si:H (micromorph) thin film solar cell was investigated experimentally and by means of rigorous 3-D optical simulation. The interplay of intermediate reflectors, with different refractive indices and thicknesse ...

Elsevier Science Bv2014

Self-Patterned Nanoparticle Layers for Vertical Interconnects: Application in Tandem Solar Cells

Christophe Ballif, Aïcha Hessler-Wyser, Fanny Sculati-Meillaud, Nicolas Blondiaux, Raphaël Pugin, Franz-Josef Haug, Mathieu Gérard Boccard, Michael Elias Stückelberger, Emmanuel Scolan, Björn Niesen

We demonstrate self-patterned insulating nanoparticle layers to define local electrical interconnects in thin-film electronic devices. We show this with thin-film silicon tandem solar cells, where we introduce between the two component cells a solution-pro ...

American Chemical Society2014

Post-deposition treatment of microcrystalline silicon solar cells for improved performance on rough superstrates

Christophe Ballif, Laura Ding, Sylvain Nicolay, Grégory Bugnon, Mathieu Gérard Boccard

In this contribution, we investigate the effect of post-deposition treatments on finished non-encapsulated thin-film microcrystalline silicon solar cells and show that annealing in vacuum leads to improved electrical properties of the solar cells, particul ...

American Institute of Physics2014

Thin-Film Silicon Triple-Junction Solar Cells on Highly Transparent Front Electrodes With Stabilized Efficiencies up to 12.8%

Christophe Ballif, Grégory Bugnon, Franz-Josef Haug, Mathieu Gérard Boccard, Matthieu Despeisse, Michael Elias Stückelberger

High-efficiency thin-film silicon triple-junction solar cells in p-i-n configuration have been fabricated using amorphous silicon top cell absorber layers, as well as microcrystalline silicon middle and bottom cell absorbers. The triple-junction cells were ...

Ieee-Inst Electrical Electronics Engineers Inc2014

High-Stable-Efficiency Tandem Thin-Film Silicon Solar Cell With Low-Refractive-Index Silicon-Oxide Interlayer

Christophe Ballif, Grégory Bugnon, Xavier Niquille, Mathieu Gérard Boccard, Matthieu Despeisse, Jordi Escarre Palou, Maximilien Joseph Marie Bonnet-Eymard

We report the recent advances and key requirements for high-efficiency "micromorph" tandem thin-film silicon solar cells composed of an amorphous silicon top cell and a microcrystalline silicon bottom cell. The impact of inserting a low-refractive-index si ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Optimized short-circuit current mismatch in multi-junction solar cells

Christophe Ballif, Fanny Sculati-Meillaud, Grégory Bugnon, Mathieu Gérard Boccard, Matthieu Despeisse, Maximilien Joseph Marie Bonnet-Eymard

Multi-junction photovoltaic devices include two or more component sub-cells which are electrically interconnected in series. At any power point, the current output of the total device is limited by the sub-cell with the smallest current density. Therefore, ...

Elsevier2013

Smoothening intermediate reflecting layer for tandem thin-film silicon solar cells

Christophe Ballif, Nicolas Blondiaux, Mathieu Gérard Boccard, Matthieu Despeisse, Corsin Battaglia

We introduce the concept of smoothening intermediate reflecting layers (IRLs) in Micromorph thin-film silicon tandem solar cells in the superstrate configuration. The aim of such structures is not only to provide a selective reflection of light for optimal ...

Elsevier2013

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

Amorphous Si Thin Film Based Photocathodes with High Photovoltage for Efficient Hydrogen Production

Christophe Ballif, Mathieu Gérard Boccard, Corsin Battaglia

An amorphous Si thin film with TiO2 encapsulation layer is demonstrated as a highly promising and stable photocathode for solar hydrogen production. With platinum as prototypical cocatalyst, a photocurrent onset potential of 0.93 V vs RHE and saturation ph ...

American Chemical Society2013

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

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

Novel Micromorph Solar Cell Structures for Efficient Light Trapping and High-Quality Absorber Layers

Mathieu Gérard Boccard

Key elements involved in the fabrication of Micromorph thin-film silicon solar cells, a tandem device including an amorphous silicon top cell and a microcrystalline silicon bottom cell, are studied in this manuscript. Due to the very short diffusion length ...

EPFL2012

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

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