Publications by Philippe Wyss | EPFL Graph Search

Rear textured p-type high temperature passivating contacts and their implementation in perovskite/silicon tandem cells

Christophe Ballif, Antoine Descoeudres, Sylvain Nicolay, Quentin Thomas Jeangros, Philippe Wyss, Soo-Jin Moon, Arnaud Walter, Andrea Ingenito

Silicon solar cells based on high temperature passivating contacts are becoming mainstream in the photovoltaic industry. Here, we developed a high-quality boron-doped poly-silicon hole contact. When combined with a co-processed phosphorus-doped poly-silico ...

Royal Soc Chemistry2023

Bulk Defects and Hydrogenation Kinetics in Crystalline Silicon Solar Cells With Fired Passivating Contacts

Christophe Ballif, Philippe Wyss, Franz-Josef Haug, Mario Joe Lehmann, Père Roca i Cabarrocas, Andrea Ingenito, Audrey Marie Isabelle Morisset

In this article, the effect of the various processing steps during the fabrication of c-Si/SiOx/SiCx fired passivating contacts on the silicon bulk lifetime is studied, and the kinetics of defect deactivation by hydrogenation is investigated. It is found t ...

2022

Evaluation of secondary electron intensities for dopant profiling in ion implanted semiconductors: a correlative study combining SE, SIMS and ECV methods

Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Philippe Wyss, Franz-Josef Haug, Mario Joe Lehmann, Audrey Marie Isabelle Morisset

This study evaluates the secondary electron (SE) dopant contrast in scanning electron microscopy (SEM) and helium ion microscopy (HIM) on boron implanted silicon sample. Complementary techniques like secondary ion mass spectrometry and electrochemical capa ...

IOP PUBLISHING LTD2021

Implementation and understanding of p plus fired rear hole selective tunnel oxide passivating contacts enabling > 22% conversion efficiency in p-type c-Si solar cells

Christophe Ballif, Sylvain Nicolay, Philippe Wyss, Franz-Josef Haug, Matthieu Despeisse, Andrea Ingenito, Sofia Libraro

Passivating contacts are key enablers for high efficiency c-Si solar cells. Here, we present our latest advancement in terms of implementation and understanding in fired passivating contacts (FPC) used as rear p + passivating contact in p-type solar cells. ...

ELSEVIER2021

Passivating Polysilicon Recombination Junctions for Crystalline Silicon Solar Cells

Christophe Ballif, Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Philippe Wyss, Franz-Josef Haug, Mario Joe Lehmann, Andrea Ingenito, Audrey Marie Isabelle Morisset

Polysilicon recombination junctions whose n-type bottom layers double as a passivating contact to the silicon surface are investigated. Such recombination junctions are a key element in the interconnection of tandem devices with a silicon bottom cell, and ...

2021

A Mixed-Phase SiOx Hole Selective Junction Compatible With High Temperatures Used in Industrial Solar Cell Manufacturing

Christophe Ballif, Quentin Thomas Jeangros, Philippe Wyss, Xavier Niquille, Franz-Josef Haug, Matthieu Despeisse, Mario Joe Lehmann, Iris Anita Mack, Gizem Nogay, Josua Andreas Stückelberger, Andrea Ingenito

We present a p-type passivating rear contact that complies with integration into standard solar cell manufacturing with phosphorus-diffused front side. Our contact structure consists of a thin SiOx tunneling layer grown by wet chemistry and a stack of laye ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2020

Analysis of hydrogen distribution and migration in fired passivating contacts (FPC)

Christophe Ballif, Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Philippe Wyss, Franz-Josef Haug, Matthieu Despeisse, Mario Joe Lehmann, Andrea Ingenito

High temperature passivating contacts for c-Si based solar cells are intensively studied because of their potential in boosting solar cell efficiency while being compatible with industrial processes at high temperatures. In this work, the hydrogenation mec ...

2019

Phosphorous-Doped Silicon Carbide as Front-Side Full-Area Passivating Contact for Double-Side Contacted c-Si Solar Cells

Christophe Ballif, Philippe Wyss, Franz-Josef Haug, Matthieu Despeisse, Gizem Nogay, Philipp Friedrich Hermann Löper, Josua Andreas Stückelberger, Andrea Ingenito, Luca Gnocchi

We present an electron selective passivating contact based on a tunneling SiOx capped with a phosphorous doped siliconcarbideandpreparedwithahigh-temperaturethermalanneal. We investigate in detail the effects of the preparation conditions of theSiCx(n)(i.e ...

2018

Recombination Analysis of Phosphorus-Doped Nanostructured Silicon Oxide Passivating Electron Contacts for Silicon Solar Cells

Christophe Ballif, Philippe Wyss, Franz-Josef Haug, Matthieu Despeisse, Gizem Nogay, Philipp Friedrich Hermann Löper, Josua Andreas Stückelberger, Andrea Ingenito

2018

Properties of mixed phase silicon-oxide-based passivating contacts for silicon solar cells

Christophe Ballif, Quentin Thomas Jeangros, Philippe Wyss, Franz-Josef Haug, Matthieu Despeisse, Iris Anita Mack, Gizem Nogay, Philipp Friedrich Hermann Löper, Josua Andreas Stückelberger, Andrea Ingenito

2018

Crystalline Silicon Solar Cells With Coannealed Electron- and Hole-Selective SiCx Passivating Contacts

Christophe Ballif, Quentin Thomas Jeangros, Philippe Wyss, Franz-Josef Haug, Monica Morales Masis, Gizem Nogay, Philipp Friedrich Hermann Löper, Josua Andreas Stückelberger, Oscar Esteban Rucavado Leandro, Andrea Ingenito

We present electron- and hole-selective passivating contacts based on wet-chemically grown interfacial SiOx and overlying in-situ doped silicon carbide (SiCx) deposited by plasma-enhanced chemical vapor deposition. After annealing at 850 degrees C, excelle ...

2018

A passivating contact concept compatible with a short thermal treatment

Christophe Ballif, Philippe Wyss, Franz-Josef Haug, Matthieu Despeisse, Gizem Nogay, Josua Andreas Stückelberger, Andrea Ingenito

In this study we present a boron-doped silicon carbide layers as a hole-selective contact which is compatible with short annealing time (typically < 1 minute) as the one used for firing of metal pastes. The application of such layers on symmetrically proce ...

IEEE2018

Interplay of annealing temperature and doping in hole selective rear contacts based on silicon-rich silicon-carbide thin films

Christophe Ballif, Philippe Wyss, Franz-Josef Haug, Matthieu Despeisse, Monica Morales Masis, Gizem Nogay, Philipp Friedrich Hermann Löper, Josua Andreas Stückelberger, Oscar Esteban Rucavado Leandro

We present a detailed optimization of a hole selective rear contact for p-type crystalline silicon solar cells which relies on full-area processes and provides full-area passivation. The passivating hole-contact is based on a layer stack comprising a chemi ...

Elsevier Science Bv2017

Solar photovoltaic module

Christophe Ballif, Philippe Wyss, Franz-Josef Haug, Philipp Friedrich Hermann Löper, Josua Andreas Stückelberger

In the present invention a new solar photovoltaic module is proposed comprising a solar cell comprising a silicon layer having a first (1 a) surface and a second surface (1a) opposite to said first surface. The solar cell further comprises a passivating la ...

2017

Passivating electron contact based on highly crystalline nanostructured silicon oxide layers for silicon solar cells

Christophe Ballif, Quentin Thomas Jeangros, Philippe Wyss, Xavier Niquille, Franz-Josef Haug, Matthieu Despeisse, Gizem Nogay, Martin Ledinsky, Philipp Friedrich Hermann Löper, Josua Andreas Stückelberger

We present a novel passivating contact structure based on a nanostructured silicon-based layer. Traditional poly-Si junctions feature excellent junction characteristics but their optical absorption induces current losses when applied to the solar cell fron ...

Elsevier Science Bv2016

Silicon-Rich Silicon Carbide Hole-Selective Rear Contacts for Crystalline-Silicon-Based Solar Cells

Christophe Ballif, Quentin Thomas Jeangros, Philippe Wyss, Xavier Niquille, Franz-Josef Haug, Matthieu Despeisse, Gizem Nogay, Philipp Friedrich Hermann Löper, Josua Andreas Stückelberger

The use of passivating contacts compatible with typical homojunction thermal processes is one of the most promising approaches to realizing high-efficiency silicon solar cells. In this work, we investigate an alternative rear-passivating contact targeting ...

2016

Influence of cations of the electrolyte on the performance and stability of dye sensitized solar cells

Michael Graetzel, Shaik Mohammed Zakeeruddin, Philippe Wyss, Thomas Moehl

The electrolyte is one of the key components for DSC and its properties have great influence on the photo-conversion efficiency and stability of the devices. Five new low volatile electrolytes containing 3-methoxypropionitrile (MPN) as solvent were prepare ...

Royal Society of Chemistry2012

Iron Resonant Photoemission Spectroscopy on Anodized Hematite Points to Electron Hole Doping during Anodization

Michael Graetzel, Philippe Wyss, Kevin Sivula, Qianli Chen, Artur Braun, Li Zhang, Jin Guo

Anodization of a-Fe2O3 (hematite) electrodes in alkaline electrolyte under constant potential conditions the electrode surface in a way that an additional current wave occurs in the cyclic voltammogram. The energy position of this current wave is closely b ...

Wiley-Blackwell2012