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Christophe Ballif

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Related publications (427)

Page 6 of 22

Solar Hydrogen Production by Amorphous Silicon Photocathodes Coated with a Magnetron Sputter Deposited Mo

Christophe Ballif, Xile Hu, Björn Niesen, Carlos Gilberto Morales Guio, Laurent Liardet

Coupling of Earth-abundant hydrogen evolution catalysts to photoabsorbers is crucial for the production of hydrogen fuel using sunlight. In this work, we demonstrate the use of magnetron sputtering to deposit Mo2C as an efficient hydrogen evolution reactio ...

Amer Chemical Soc2015

ZnSnxGe1-xN2 as electron-selective contact for silicon heterojunction solar cells

Christophe Ballif, Mathieu Gérard Boccard, Jonathan Emanuel Thomet, Luca Massimiliano Antognini, Julie Amandine Dreon, Vincent Philippe Paratte, Julien Hurni

This work reports the electrical characterization of ZnSnxGe1-xN2 (ZTGN) layers deposited on glass by sputtering and further assesses for the first time the performance of SHJ solar cells featuring them as electron-selective contacts. Bandgap, conductivity ...

IEEE2021

RE-BD AR2024. Accelerating renewable energy development while enhancing biodiversity protection in Switzerland

Christophe Ballif, Sascha Nick

RE-BD AR2024, the 2024 Assessment Report on Renewable Energy and Biodiversity, addresses the critical balance between expanding renewable energy (RE) and better protecting biodiversity in Switzerland, with a special focus on the Alpine regions. It is the r ...

CLIMACT - EPFL - UNIL2024

Analysis of lateral transport through the inversion layer in amorphous silicon/crystalline silicon heterojunction solar cells

Christophe Ballif, Stefaan De Wolf

In amorphous/crystalline silicon heterojunction solar cells, an inversion layer is present at the front interface. By combining numerical simulations and experiments, we examine the contribution of the inversion layer to lateral transport and assess whethe ...

American Institute of Physics2013

High-Stable-Efficiency Tandem Thin-Film Silicon Solar Cell With Low-Refractive-Index Silicon-Oxide Interlayer

Christophe Ballif, Matthieu Despeisse, Mathieu Gérard Boccard, Grégory Bugnon, Xavier Niquille, Jordi Escarre Palou

We report the recent advances and key requirements for high-efficiency "micromorph" tandem thin-film silicon solar cells composed of an amorphous silicon top cell and a microcrystalline silicon bottom cell. The impact of inserting a low-refractive-index si ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Comparison of LPCVD and sputter-etched ZnO layers applied as front electrodes in tandem thin-film silicon solar cells

Christophe Ballif, Franz-Josef Haug, Grégory Bugnon, Michael Elias Stückelberger, Etienne Antoine Julien Moulin

Aluminum-doped zinc oxide (ZnO:Al) layers deposited by sputtering and boron-doped zinc oxide (ZnO:B) layers deposited by low-pressure chemical vapor deposition (LPCVD) are well-established materials for front electrodes in thin-film silicon solar cells. In ...

Elsevier2016

One-type-fits-all-systems: Strategies for preventing potential-induced degradation in crystalline silicon solar photovoltaic modules

Christophe Ballif, Alessandro Francesco Aldo Virtuani, Eleonora Annigoni

In this work, we investigate the relationship between potential-induced degradation (PID) and the bill of material used in module manufacturing. We manufacture samples with different combination of materials, using two types of solar cells (conventional vs ...

WILEY2019

A comprehensive analysis of electron emission from a-Si:H/Al2O3 at low energies

Christophe Ballif, Nicolas Würsch, Jonathan Emanuel Thomet, Janina Christine Isabelle Löffler, Samira Alexandra Frey

Recently developed microchannel plates (MCPs) based on amorphous silicon offer potential advantages with respect to glass based ones. In this context, secondary electron emission (SEE) at very low energies below 100 eV has been studied for relevant materia ...

IOP Publishing Ltd2023

New Developments in Amorphous Silicon Based Microchannel Plates

Christophe Ballif, Nicolas Würsch, Luca Massimiliano Antognini, Samira Alexandra Frey, Mohammad Beygi

Microchannel plates fabricated from hydrogenated amorphous silicon (AMCPs) are a promising alternative to conventional glass microchannel plates. Their main advantages lie in their flexible fabrication processes, allowing for adaptable channel shapes and t ...

2023

Fabrication and Characterization of High Aspect Ratio Amorphous Silicon Based Microchannel Plates

Christophe Ballif, Nicolas Würsch, Janina Christine Isabelle Löffler, Samira Alexandra Frey, Mohammad Beygi

This contribution focuses on the fabrication and characterization of microchannel plates made of hydrogenated amorphous silicon (AMCPs). Flexible fabrication processes and the semi-conducting nature of amorphous silicon could give these detectors the advan ...

2021

Linking Nanoscopic Insights to Millimetric-Devices in Formamidinium-Rich Perovskite Photovoltaics

Christophe Ballif, Aïcha Hessler-Wyser, Quentin Thomas Jeangros, Mostafa Rabie Shlaly Bahr Othman

Halide-perovskite semiconductors have a high potential for use in single-junction and tandem solar cells. Despite their unprecedented rise in power conversion efficiencies (PCEs) for photovoltaic (PV) applications, it remains unclear whether perovskite sol ...

Wiley-V C H Verlag Gmbh2024

Understanding and Mitigating the Degradation of Perovskite Solar Cells Based on a Nickel Oxide Hole Transport Material during Damp Heat Testing

Christophe Ballif, Kevin Sivula, Jun Ho Yum, Mounir Driss Mensi, Yongpeng Liu, Christian Michael Wolff, Marion Solange Madeleine Dussouillez

The development of stable materials, processable on alarge area,is a prerequisite for perovskite industrialization. Beyond the perovskiteabsorber itself, this should also guide the development of all otherlayers in the solar cell. In this regard, the use o ...

AMER CHEMICAL SOC2023

Injection-dependent lateral resistance in front-junction solar cells with nc-Si:H and a-Si:H hole selective contact

Christophe Ballif, Mathieu Gérard Boccard, Jan Haschke, Jean Cattin

We investigate the role of lateral transport of minority carriers in the wafer for front-junction solar cells. The study is based on two silicon heterojunction solar cells with p-type amorphous (a-Si), and nanocrystalline (nc-Si) silicon as hole selective ...

IEEE2019

Mitigating the impact of distributed PV in a low-voltage grid using electricity tariffs

Christophe Ballif, Nicolas Würsch, Jordan Holweger, Lionel Benjamin Bloch

A high share of distributed photovoltaic (PV) generation in low-voltage networks may lead to over-voltage, and line/transformer overloading. To mitigate these issues, we investigate how advanced electricity tariffs could ensure safe grid operation while en ...

2020

Probing Photocurrent Nonuniformities in the Subcells of Monolithic Perovskite/Silicon Tandem Solar Cells

Christophe Ballif, Stefaan De Wolf, Björn Niesen, Jérémie Werner, Florent Sahli

Perovskite/silicon tandem solar cells with high power conversion efficiencies have the potential to become a commercially viable photovoltaic option in the near future. However, device design and optimization is challenging because conventional characteriz ...

Amer Chemical Soc2016

Light Management: A Key Concept in High-Efficiency Perovskite/Silicon Tandem Photovoltaics

Christophe Ballif, Florent Sahli, Daniel Anthony Jacobs

The remarkable recent progress in perovskite photovoltaics affords a novel opportunity to advance the power conversion efficiency of market-dominating crystalline silicon (c-Si) solar cells. A severe limiting factor in the development of perovskite/c-Si ta ...

AMER CHEMICAL SOC2019

Effect of debris on the silicon wafering for solar cells

Christophe Ballif

The wafers used by the photovoltaic industry are mostly produced by multi-wire slurry sawing. One of the key factors determining the wafer quality (presence of saw marks and chips, increased roughness, wafer thickness variations and wafer strength) is the ...

Elsevier2011

Low-Temperature Screen-Printed Metallization for the Scale-Up of Two-Terminal Perovskite-Silicon Tandems

Christophe Ballif, Matthieu Despeisse, Sylvain Nicolay, Antonin Faes, Soo-Jin Moon, Jacques Levrat, Laura Ding, Gabriel Christmann, Bertrand Yves Paul Paviet-Salomon, Arnaud Walter, Adriana Paracchino

Tandem photovoltaic devices based on perovskite and crystalline silicon (PK/c-Si) absorbers have the potential to push commercial silicon single junction devices beyond their current efficiency limit. However, their scale-up to industrially relevant sizes ...

AMER CHEMICAL SOC2019

Unsupervised algorithm for disaggregating low-sampling-rate electricity consumption of households

Christophe Ballif, Nicolas Würsch, Jordan Holweger, Lionel Benjamin Bloch, Marina Dorokhova

Non-intrusive load monitoring (NILM) has been extensively researched over the last decade. The objective of NILM is to identify the power consumption of individual appliances and to detect when particular devices are on or off from measuring the power cons ...

2019

Influence of the Dopant Gas Precursor in P-Type Nanocrystalline Silicon Layers on the Performance of Front Junction Heterojunction Solar Cells

Christophe Ballif, Mathieu Gérard Boccard, Quentin Thomas Jeangros, Luca Massimiliano Antognini, Jan Haschke, Jean Cattin, Mario Joe Lehmann, Julie Amandine Dreon, Vincent Philippe Paratte, Laurie-Lou Senaud

Silicon heterojunction solar cells can employ p-type hydrogenated nanocrystalline silicon nc-Si:H(p) on their front side, since these can provide better transparency and contact resistance compared to hydrogenated p-type amorphous silicon layers. We invest ...

2021