Personne

Simon Hänni

Cette personne n’est plus à l’EPFL

Publications associées (19)

Morphology stabilization strategies for small-molecule bulk heterojunction photovoltaics

Kevin Sivula, Liang Yao, Xavier Adrian Jeanbourquin, Simon Hänni, Arvindh Sekar, Emilie Aude Marie Ripaud

The greater crystallinity of solution-processed small-molecule organic semiconductors, compared to their polymer counterparts, renders the bulk heterojunction (BHJ) more susceptible to phase separation under thermal stress, decreasing device performance. H ...
2017

Quantification of Valleys of Randomly Textured Substrates as a Function of Opening Angle: Correlation to the Defect Density in Intrinsic nc-Si:H

Jan-Willem Alexander Schüttauf, Simon Hänni

Optical and electrical properties of hydrogenated nanocrystalline silicon (nc-Si:H) solar cells are strongly influenced by the morphology of underlying substrates. By texturing the substrates, the photogenerated current of nc-Si:H solar cells can increase ...
Amer Chemical Soc2016

Strategies for Doped Nanocrystalline Silicon Integration in Silicon Heterojunction Solar Cells

Christophe Ballif, Aïcha Hessler-Wyser, Antoine Descoeudres, Jonas Geissbühler, Stefaan De Wolf, Gizem Nogay, Martial Duchamp, Johannes Peter Seif, Simon Hänni, Martin Ledinsky, Niels Holm

Carrier collection in silicon heterojunction (SHJ) solar cells is usually achieved by doped amorphous silicon layers of a few nanometers, deposited at opposite sides of the crystalline silicon wafer. These layers are often defect-rich, resulting in modest ...
Ieee-Inst Electrical Electronics Engineers Inc2016

Recent advances and remaining challenges in thin-film silicon photovoltaic technology

Christophe Ballif, Franz-Josef Haug, Jan-Willem Alexander Schüttauf, Matthieu Despeisse, Mathieu Gérard Boccard, Grégory Bugnon, Michael Elias Stückelberger, Simon Hänni, Jeremy Persoz

This contribution reviews some of the latest achievements and challenges in thin-film silicon photovoltaic (PV) technology based on amorphous and nanocrystalline silicon and their alloys. We address material and device developments, including (i) improved ...
Elsevier2015

Microcrystalline silicon solar cells with passivated interfaces for high open-circuit voltage

Christophe Ballif, Franz-Josef Haug, Jan-Willem Alexander Schüttauf, Matthieu Despeisse, Mathieu Gérard Boccard, Grégory Bugnon, Simon Hänni

We introduce passivating hetero-interfaces in single-junction microcrystalline silicon (mc-Si:H) solar cells. We investigate the effect of different i–n layer stacks in thin mc-Si:H devices, in which recombination is significant at the interfaces as well a ...
Wiley-VCH Verlag Berlin2015

Light-Management Strategies for Thin-Film Silicon Multijunction Solar Cells

Christophe Ballif, Aïcha Hessler-Wyser, Xavier Niquille, Nicolas Blondiaux, Jan-Willem Alexander Schüttauf, Mathieu Gérard Boccard, Björn Niesen, Michael Elias Stückelberger, Etienne Antoine Julien Moulin, Fanny Sculati-Meillaud, Simon Hänni, Elmar Feuser, Raphaël Pugin, Emmanuel Scolan

Light management is of crucial importance to reach high efficiencies with thin-film silicon multijunction solar cells. In this contribution, we present light-management strategies that we recently developed. This includes high quality absorber materials, l ...
2014

Silicon oxide buffer layer at the p-i interface in amorphous and microcrystalline silicon solar cells

Christophe Ballif, Matthieu Despeisse, Grégory Bugnon, Michael Elias Stückelberger, Gaetano Parascandolo, Fanny Sculati-Meillaud, Simon Hänni, Mathieu Charrière

The use of intrinsic silicon oxide as a buffer layer at the p-i interface of thin-film silicon solar cells is shown to provide significant advantages. For microcrystalline silicon solar cells, when associated with highly crystalline i-layers deposited at h ...
Elsevier2013

High-efficiency microcrystalline silicon single-junction solar cells

Christophe Ballif, Jordi Escarre Palou, Matthieu Despeisse, Mathieu Gérard Boccard, 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

New progress in the fabrication of n–i–p micromorph solar cells for opaque substrates

Christophe Ballif, Franz-Josef Haug, Matthieu Despeisse, Mathieu Gérard Boccard, Sylvain Nicolay, Grégory Bugnon, Laura Ding, Karin Söderström, Gaetano Parascandolo, Martial Duchamp, Simon Hänni, Céline Pahud, Rémi Biron

In thispaper,weinvestigatetandemamorphous/microcrystallinesiliconsolarcellswithasymmetric intermediatereflectorsgrowninthen–i–psubstrateconfiguration.Wecomparedifferenttypesof substrateswithrespecttotheirlight-trappingpropertiesaswellastheirinfluenceontheg ...
Elsevier2013

Nanometer- and Micrometer-Scale Texturing for High-Efficiency Micromorph Thin-Film Silicon Solar Cells

Christophe Ballif, Corsin Battaglia, Jordi Escarre Palou, Matthieu Despeisse, Mathieu Gérard Boccard, Sylvain Nicolay, Grégory Bugnon, Laura Ding, Karin Söderström, Peter Cuony, Fanny Sculati-Meillaud, Simon Hänni, Adrian Billet, Mathieu Charrière, Mustapha Benkhaira

Optimized transparent conductive oxide front electrodes are vital to further increase the efficiency of thin-film silicon solar devices. We report details on the fabrication of multiscale textured zinc oxide substrates and their implementation in amorphous ...
2012

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