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Mathieu Gérard Boccard

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Publications associées (80)

Performance Limitations and Analysis of Silicon Heterojunction Solar Cells Using Ultra-Thin MoOx Hole-Selective Contacts

Christophe Ballif, Gabriel Christmann, Mathieu Gérard Boccard, Jean Cattin, Luca Massimiliano Antognini, Vincent Philippe Paratte, Julie Amandine Dreon

We recently showed that silicon heterojunction solar cell with MoOx-based hole-selective contact could reach 23.5% in efficiency with MoOx layers of 4 nm. Such thin MoOx layer enables a considerable current-density gain of over 1 mA/cm(2) compared to the u ...

2021

Dopant‐free back contacted silicon solar cells with an efficiency of 22.1%

Christophe Ballif, Quentin Thomas Jeangros, Mathieu Gérard Boccard, Matthieu Despeisse, Bertrand Yves Paul Paviet-Salomon, Sihua Zhong, Weiliang Wu, Wenjie Lin, Hui Shen

2020

Hole-Selective Front Contact Stack Enabling 24.1%-Efficient Silicon Heterojunction Solar Cells

Christophe Ballif, Sylvain Nicolay, Mathieu Gérard Boccard, Matthieu Despeisse, Jean Cattin, Luca Massimiliano Antognini, Vincent Philippe Paratte, Laurie-Lou Senaud, Bertrand Yves Paul Paviet-Salomon, Minh Truong, Jan Haschke, Julie Amandine Dreon, Wenjie Lin

The window-layer stack limits the efficiency of both-side-contacted silicon heterojunction solar cells. We discuss here the combination of several modifications to this stack to improve its optoelectronic performance. These include the introduction of a na ...

2020

Evaluating Materials Design Parameters of Hole-Selective Contacts for Silicon Heterojunction Solar Cells

Christophe Ballif, Mathieu Gérard Boccard, Jan Haschke, Rachel Emma Woods-Robinson, Angela Nicole Fioretti

Silicon heterojunction (SHJ) solar cell efficiencies are limited by parasitic absorption from the hydrogenated amorphous silicon (a-Si:H) front contact, but this may be mitigated by selecting an alternative carrier selective contact material with a wider b ...

2020

Lateral transport in silicon solar cells

Christophe Ballif, Gabriel Christmann, Mathieu Gérard Boccard, Jan Haschke

We investigate lateral charge carrier transport in crystalline silicon solar cells. Under typical operation illumination of high-efficiency solar cells, a significant population of electrons and holes exist in the silicon wafer, leading to a non-negligible ...

AIP2020

23.5%-efficient silicon heterojunction silicon solar cell using molybdenum oxide as hole-selective contact

Christophe Ballif, Quentin Thomas Jeangros, Mathieu Gérard Boccard, Jean Cattin, Luca Massimiliano Antognini, Jan Haschke, Julie Amandine Dreon

Elsevier2020

Influence of the Subcell Properties on the Fill Factor of Two-Terminal Perovskite-Silicon Tandem Solar Cells

Christophe Ballif, Mathieu Gérard Boccard

The performance of a tandem solar cell depends on the performance of its constituting subcells. Although this dependency is theoretically straightforward for open-circuit voltage (V-oc) and short-circuit current, it is indirect for fill factor (FF) and thu ...

2020

Comparative Field Performance Assessment of Bifacial Solar Modules

Mathieu Gérard Boccard, Jean Cattin, Olivier Denis Dupré

A full-scale pilot line for producing bifacial solar modules based on silicon heterojunction technology was set up as part of the European H2020 AMPERE project. In this study, the measurements from two outdoor test benches were used to evaluate the perform ...

IEEE2020

Influence of local surface defects on the minority-carrier lifetime of passivating-contact solar cells

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

Unlocking the full potential of passivating contacts, increasingly popular in the silicon solar cell industry, requires determining the minority carrier lifetime. Minor passivation drops limit the functioning of solar cells; however, they are not detected ...

AIP American Institute of Physics2020

Illumination-Dependent Requirements for Heterojunctions and Carrier-Selective Contacts on Silicon

Mathieu Gérard Boccard, Jakub Holovsky, Luca Massimiliano Antognini

High efficiency silicon solar cells generally feature heterojunction or carrier-selective contact architectures, for which there is current interest in developing structures using a wide range of materials. The electrical and optical requirements that thes ...

2020

Linking simulation and synthesis of nickel oxide hole-selective contacts for silicon heterojunction solar cells

Christophe Ballif, Mathieu Gérard Boccard, Jan Haschke, Rachel Emma Woods-Robinson, Angela Nicole Fioretti

In silicon heterojunction (SHJ) solar cells, one factor limiting efficiency is "parasitic absorption" from amorphous silicon (a-Si) at the front surface. Thus, discovery of a transparent hole-selective contact to replace p-type a-Si is a promising area of ...

IEEE2020

High-Efficiency Silicon Heterojunction Solar Cells: Materials, Devices and Applications

Mathieu Gérard Boccard, Yining Li

Photovoltaic (PV) technology offers an economic and sustainable solution to the challenge of increasing energy demand in times of global warming. The world PV market is currently dominated by the homo-junction crystalline silicon (c-Si) PV technology based ...

2020

Design Rules to Fully Benefit From Bifaciality in Two-Terminal Perovskite/Silicon Tandem Solar Cells

Christophe Ballif, Quentin Thomas Jeangros, Mathieu Gérard Boccard, Arttu Matias Tuomiranta, Pierre-Jean Alet, Olivier Denis Dupré

The photovoltaics industry is adopting bifacial systems which offer improved energy harvesting compared to monofacial ones. This stems from the collection of light reflected by the surroundings on the rear side of the modules, leading to system-level gains ...

2020

Degradation Mechanism and Stability Improvement of Dopant-Free ZnO/LiFx/Al Electron Nanocontacts in Silicon Heterojunction Solar Cells

Christophe Ballif, Quentin Thomas Jeangros, Mathieu Gérard Boccard, Jonathan Emanuel Thomet, Luca Massimiliano Antognini, Vincent Philippe Paratte, Julie Amandine Dreon, Sihua Zhong, Wenjie Lin

Dopant-free passivating contacts for photovoltaics have the potential to be deposited at low costs, while providing excellent surface passivation and low contact resistance. However, one pressing issue of dopant-free carrier selective contacts is their low ...

2020

Optimized Design of Silicon Heterojunction Solar Cells for Field Operating Conditions

Christophe Ballif, Mathieu Gérard Boccard, Jean Cattin, Jan Haschke, Brahim Aissa, Olivier Denis Dupré

Solar modules are currently characterised at standard test conditions (STC), defined at 1000 W/m2 and 25 °C. However, solar modules in actual outdoor operating conditions typically operate at lower illumination and higher temperature than STC, which signif ...

2019

Low Temperature p-type Microcrystalline Silicon as Carrier Selective Contact for Silicon Heterojunction Solar Cells

Christophe Ballif, Mathieu Gérard Boccard, Raphaël Monnard, Angela Nicole Fioretti

Silicon heterojunction (SHJ) solar cells have reached record efficiency, particularly in all-back-contacted architectures. Despite this, two-side contacted SHJ cells still suffer from parasitic absorption and series resistance losses in the amorphous silic ...

2019

Gallium Nitride as Transparent Electron-Selective Contact in Silicon Heterojunction Solar Cells

Christophe Ballif, Mathieu Gérard Boccard, Yashi Xiao, Angela Nicole Fioretti, Tzu-Chin Chang Chien

Carrier-selective, passivating contacts have allowed silicon heterojunction (SHJ) cells to reach recordbreaking efficiencies particularly in all-back-contacted designs. However, two-side-contacted SHJ cell efficiency has been limited due in part to parasit ...

2019

Development of N-Type Amorphous and Microcrystalline Hydrogenated Silicon-Oxides (SiOx:H) and Investigation of their Impact as Window Layers on Silicon Heterojunction Solar Cells Device

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

We report on the development of hydrogenated n-type amorphous and microcrystalline silicon oxides ((n)-SiOx:H and (n) mu c-SiOx:H, respectively) by PECVD, and their successful integration as n-window layers for silicon heterojunction (SHJ) solar cells devi ...

IEEE2019

25.1%-Efficient Monolithic Perovskite/Silicon Tandem Solar Cell Based on a p-type Monocrystalline Textured Silicon Wafer and High-Temperature Passivating Contacts

Christophe Ballif, Quentin Thomas Jeangros, Franz-Josef Haug, Mathieu Gérard Boccard, Matthieu Despeisse, Jérémie Werner, Florent Sahli, Gizem Nogay, Andrea Ingenito

2019

Paths for maximal light incoupling and excellent electrical performances in silicon heterojunction solar cells

Christophe Ballif, Mathieu Gérard Boccard, Matthieu Despeisse, Jean Cattin, Raphaël Monnard, Luca Massimiliano Antognini, Vincent Philippe Paratte, Laurie-Lou Senaud, Monica Morales Masis, Bertrand Yves Paul Paviet-Salomon, Oscar Esteban Rucavado Leandro, Jan Haschke, Olivier Denis Dupré, Julie Amandine Dreon, Sihua Zhong, Angela Nicole Fioretti

We discuss here optical losses in silicon heterojunction solar cells and strategies to minimize them. Optical losses originate from most non-crystalline-silicon layers involved in the solar cell. A breakdown for typical values is shown evidencing that supp ...

IEEE2019

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