Publications by Julien Claude Bailat

Solar-to-Hydrogen Production at 14.2% Efficiency with Silicon Photovoltaics and Earth-Abundant Electrocatalysts

Christophe Ballif, Antonio Delfino, Antonin Faes, Demetri Psaltis, David Lambelet, Matthieu Despeisse, Christophe Moser, Jan-Willem Alexander Schüttauf, Julien Claude Bailat, Miguel Antonio Modestino, Enrico Chinello

Affordable, stable and earth-abundant photo-electrochemical materials are indispensable for the large-scale implementation of sunlight-driven hydrogen production. Here we present an intrinsically stable and scalable solar water splitting device that is ful ...

Electrochemical Society2016

Organic-inorganic halide perovskite/crystalline silicon four-terminal tandem solar cells

Christophe Ballif, Sylvain Nicolay, Jun Ho Yum, Soo-Jin Moon, Stefaan De Wolf, Julien Claude Bailat, Björn Niesen, Martin Ledinsky

Tandem solar cells constructed from a crystalline silicon (c-Si) bottom cell and a low-cost top cell offer a promising way to ensure long-term price reductions of photovoltaic modules. We present a four-terminal tandem solar cell consisting of a methyl amm ...

Royal Society of Chemistry2015

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

Laser-Scribing Patterning for the Production of Organometallic Halide Perovskite Solar Modules

Christophe Ballif, Laurent Fabien Hubert Sansonnens, Sylvain Nicolay, Jun Ho Yum, Soo-Jin Moon, Arnaud Walter, Mustapha Benkhaira, Julien Claude Bailat

Efficiencies of solar cells based on organometallic halide perovskite absorber material have dramatically increased over the past few years. Most of efficiencies reported so far have, however, been obtained on solar cells with very small lab-scale area of ...

Ieee-Inst Electrical Electronics Engineers Inc2015

Silane depletion dependent ion bombardment and material quality of microcrystalline silicon deposited by VHF-PECVD

Christophe Ballif, Andrea Feltrin, Grégory Bugnon, Julien Claude Bailat

Microcrystalline silicon is a composite material embedding silicon nanocrystals in an amorphous matrix [1]. It has attracted much research efforts in the photovoltaic domain [2], because of its potential for integration in a tandem cell concept as bottom c ...

2009

Influence of pressure and silane depletion on microcrystalline silicon material quality and solar cell performance

Christophe Ballif, Andrea Feltrin, Grégory Bugnon, Julien Claude Bailat

Hydrogenated microcrystalline silicon growth by very high frequency plasma-enhanced chemical vapor deposition is investigated in an industrial-type parallel plate R&D KAI (TM) reactor to study the influence of pressure and silane depletion on material qual ...

2009

Thin film silicon solar cells in a semi-transparent micro-structured metal substrate configuration

Christophe Ballif, Sylvie Faÿ, Julien Claude Bailat

We present our work on the combination of thin film silicon solar cells and a commercial window shading device (MicroShadeTM, PhotoSolar) into a novel, glass integrated photovoltaic product for building integration. The development of amorphous silicon sol ...

2009

Conducting two-phase silicon oxide layers for thin-film silicon solar cells

Christophe Ballif, Andrea Feltrin, Julien Claude Bailat

We present optical properties and microstructure analyses of hydrogenated silicon suboxide layers containing silicon nanocrystals (nc-SiOx:H). This material is especially adapted for the use as intermediate reflecting layer (IRL) in micromorph silicon tand ...

2009

Low power high growth rate deposition of microcrystalline silicon

Christophe Ballif, Andrea Feltrin, Grégory Bugnon, Julien Claude Bailat

Microcrystalline growth regimes and solar cells obtained in different pressure and silane depletion conditions are studied in a large area KAI-S plasma reactor. The microcrystalline material quality is systematically investigated by Fourier Transform Photo ...

2008

Influence of ion bombardment on microcrystalline silicon material quality and solar cell performances

Christophe Ballif, Fanny Sculati-Meillaud, Andrea Feltrin, Grégory Bugnon, Julien Claude Bailat

Microcrystalline hydrogenated silicon growth with VHF-PECVD was examined in an industrial type parallel plate KAITM reactor. The influence of pressure on material quality was studied in single junction solar cells. Solar cells with their intrinsic layer pr ...

2008

Micromorph tandem solar cells grown at high rate with in-situ intermediate reflector in industrial KAI PECVD reactors

Christophe Ballif, Andrea Feltrin, Grégory Bugnon, Adrian Billet, Julien Claude Bailat

We report on the latest results of tandem micromorph (a-Si:H/μc-Si:H) silicon solar cells fabricated in commercial Oerlikon Solar KAI-S and KAI-M PECVD reactors. First developments of in-situ silicon oxide based intermediate reflector (SOIR) in KAI reactor ...

2008