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Grégory Bugnon

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Publications associées (34)

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LATEST DEVELOPMENTS ON MICROMORPH TANDEM CELLS AT IMT

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

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

Light Harvesting Schemes for High Efficiency Thin Film Silicon Solar Cells

Christophe Ballif, Matthieu Despeisse, Mathieu Gérard Boccard, Grégory Bugnon, Corsin Battaglia, Sylvain Nicolay, Michael Elias Stückelberger, Jordi Escarre Palou, Laura Ding, Peter Cuony, Gaetano Parascandolo

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

Research and developments in thin film silicon photovoltaics

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

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

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

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

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

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

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

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

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

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

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

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

Christophe Ballif, Andrea Feltrin, Grégory Bugnon

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

ZnO Transparent conductive oxide for thin film silicon solar cells

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

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

Input silane concentration effect on the a-Si:H to uc-Si:H transition width

Christophe Ballif, Christoph Hollenstein, Andrea Feltrin, Benjamin Strahm, Grégory Bugnon, Fanny Sculati-Meillaud

In this work the microstructure transition width from amorphous to microcrystalline silicon is discussed. It is shown that the width of the transition depends on the input silane concentration level and indirectly on the silane depletion level. The higher ...

2010

Geometric light trapping for high efficiency thin film silicon solar cells

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

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

High-rate deposition of microcrystalline silicon in a large-area PECVD reactor and integration in tandem solar cells

Christophe Ballif, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon

We study the high-rate deposition of microcrystalline silicon in a large-area plasma-enhanced chemical-vapor-deposition (PECVD) reactor operated at 40.68 MHz, in the little-explored process conditions of high-pressure and high-silane concentration and depl ...

2010

High-efficiency microcrystalline silicon single-junction solar cells

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

Development of Micromorph Cells in Large-Area Industrial Reactor

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

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

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

Christophe Ballif, Andrea Feltrin, Grégory Bugnon

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