Publications de Franz-Josef Haug

Publications associées (108)

Quantification of hydrogen in nanostructured hydrogenated passivating contacts for silicon photovoltaics combining SIMS-APT-TEM: A multiscale correlative approach

Franz-Josef Haug, Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Mario Joe Lehmann

Multiscale characterization of the hydrogenation process of silicon solar cell contacts based on c-Si/SiOx/ncSiCx(p) has been performed by combining dynamic secondary ion mass-spectrometry (D-SIMS), atom probe tomography (APT), and transmission electron mi ...

ELSEVIER2021

Temperature dependence of hydrogenated amorphous silicon solar cell performances

Christophe Ballif, Franz-Josef Haug, Michael Elias Stückelberger, Yannick Samuel Riesen

Thin-film hydrogenated amorphous silicon solar (a-Si:H) cells are known to have better temperature coefficients than crystalline silicon cells. To investigate whether a-Si:H cells that are optimized for standard conditions (STC) also have the highest energ ...

American Institute of Physics2016

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

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

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

Carrier generation and collection in Zn3P2/InP heterojunction solar cells

Anna Fontcuberta i Morral, Franz-Josef Haug, Simon Robert Escobar Steinvall, Mahdi Zamani, Rajrupa Paul, Mirjana Dimitrievska, Valerio Piazza, Julien Hurni, Vanessa Conti, Anja Tiede, Joel René Sapera

Zinc phosphide (Zn3P2) has been lauded as a promising solar absorber material due to its functional properties and the abundance of zinc and phosphorous. In the last 4 decades, there has not been any significant improvement in the efficiencies of Zn3P2-bas ...

ELSEVIER2023

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

Christophe Ballif, Franz-Josef Haug, Matthieu Despeisse, Mathieu Gérard Boccard, 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

Optimization of front SiNx/ITO stacks for high-efficiency two-side contacted c-Si solar cells with co-annealed front and rear passivating contacts

Christophe Ballif, Franz-Josef Haug, Sylvain Nicolay, Xavier Niquille, Andrea Ingenito, Frank Meyer, Arnaud François Pascal Savoy

In this contribution, we present an electron selective passivating contact metallised with a low temperature process to target front side applications in crystalline silicon (c-Si) solar cells. In addition to an interfacial silicon oxide (SiOx) and an in-s ...

2020

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

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

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

Contributions to the contact resistivity in fired tunnel-oxide passivating contacts for crystalline silicon solar cells

Christophe Ballif, Franz-Josef Haug, Andrea Ingenito, Sofia Libraro, Frank Meyer

We investigate the contact resistivity of p-type passivating contacts for silicon solar cells. Our contact structures are compatible with firing, a rapid annealing process similar to the one used for sintering of the screen-printed metallisation in solar c ...

2019

Observation of fracture and plastic deformation during indentation and scratching inside the scanning electron microscope

Franz-Josef Haug, Johann Michler, Jean-Marc Breguet, Sven Nico Stauss

During nanoindentation measurements of thin films the formation of cracks within the film as well as of pile-up or sink-in around the indent are known to affect significantly the precision of hardness and Young's modulus values. The crack pattern in brittl ...

2004

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

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

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

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

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

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

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

Resonant Absorption Enhancement in Solar Cells With Periodically Textured Interfaces

Christophe Ballif, Franz-Josef Haug

We study the interaction of electromagnetic waves in layered media with textured interfaces. Experimental results of a solar cell grown on a sinusoidal back reflector are compared with a theoretical model using an expansion into diffraction modes. We assum ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Resonances and absorption enhancement in thin film silicon solar cells with periodic interface texture

Christophe Ballif, Franz-Josef Haug, Karin Söderström, Ali Naqavi

We study absorption enhancement by light scattering at periodically textured interfaces in thin film silicon solar cells. We show that the periodicity establishes resonant coupling to propagating waveguide modes. Ideally, such modes propagate in the high i ...

American Institute of Physics2011

Localisation of front side passivating contacts for direct metallisation of high-efficiency c-Si solar cells

Christophe Ballif, Franz-Josef Haug, Sylvain Nicolay, Xavier Niquille, Andrea Ingenito, Frank Meyer

In this work, we present the development of passivating contacts based on thin interfacial oxide/doped polysilicon for two side contacted c-Si solar cells. In the first part, we discuss our layer optimization towards direct metallisation, using firing thro ...

ELSEVIER2022

Co-annealing of PECVD boron emitters and poly-Si passivating contacts for leaner TOPCon solar cell fabrication

Christophe Ballif, Franz-Josef Haug, Sofia Libraro, Julien Hurni, Ezgi Genç

This study investigates the feasibility of a single-step annealing process for tunnel oxide passivating contact (TOPCon) solar cell fabrication to replace the conventional two-step approach. We present a novel method using a single thermal treatment to sim ...

2025

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

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

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

Status and perspectives of crystalline silicon photovoltaics in research and industry

Christophe Ballif, Franz-Josef Haug, Mathieu Gérard Boccard

Crystalline silicon (c-Si) photovoltaics has long been considered energy intensive and costly. Over the past decades, spectacular improvements along the manufacturing chain have made c-Si a low-cost source of electricity that can no longer be ignored. Over ...

2022

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, 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

Understanding and mitigating resistive losses in fired passivating contacts: role of the interfaces and optimization of the thermal budget

Christophe Ballif, Franz-Josef Haug, Aïcha Hessler-Wyser, Luca Massimiliano Antognini, Sofia Libraro, Audrey Marie Isabelle Morisset, Julien Hurni, Ezgi Genç

This work presents a study of p-type passivating contacts based on SiCx formed via a rapid thermal processing (RTP) step, using conditions compatible with the firing used to sinter screen-printed metallization pastes in industry. The contributions of the t ...

Elsevier2023