Publications by Jan Haschke | EPFL Graph Search

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

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

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

Influence of Light Soaking on Silicon Heterojunction Solar Cells With Various Architectures

Christophe Ballif, Mathieu Gérard Boccard, Matthieu Despeisse, Jean Cattin, Laurie-Lou Senaud, Bertrand Yves Paul Paviet-Salomon, Jan Haschke

In this article, we investigate the effect of prolonged light exposure on silicon heterojunction solar cells. We show that, although light exposure systematically improves solar cell efficiency in the case of devices using intrinsic and p-type layers with ...

2021

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 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

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

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

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

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

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, Jean Cattin, Jan Haschke

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

Impact of the Oxygen Content on the Optoelectronic Properties of the Indium-Tin-Oxide Based Transparent Electrodes for Silicon Heterojunction Solar Cells

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

Amorphous/crystalline silicon heterojunction (SHJ) solar cells technology is attracting tremendous attention in recent years due to its potential to achieve high power conversion efficiencies at low fabrication temperatures and using few process steps. How ...

AMER INST PHYSICS2019

Impact of the Oxygen Flow during the Magnetron Sputtering Deposition on the Indium Tin Oxide thin films for Silicon Heterojunction Solar Cell

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

We report on the optoelectronic properties of ITO layers deposited by DC sputtering, using different oxygen to total flow ratios [r(O-2) = O-2/Ar, ranging from 1% to 8%], for silicon heterojunction (SHJ) solar cell application. The depth profiling of the v ...

IEEE2019

Annealing of Silicon Heterojunction Solar Cells: Interplay of Solar Cell and Indium Tin Oxide Properties

Christophe Ballif, Mathieu Gérard Boccard, Raphaël François Lemerle, Jan Haschke, Brahim Aissa

In this paper, we report the evolution of silicon heterojunction solar cell properties focusing, in particular, on the indium tin oxide (ITO) layers upon consecutive thermal annealing. We find that the charge carrier density

N_{\rm e}

of the ITO increase ...

2019

Silicon Heterojunction Solar Cells on Quasi-mono Wafers

Christophe Ballif, Antoine Descoeudres, Mathieu Gérard Boccard, Matthieu Despeisse, Loris Barraud, Raphaël Monnard, Jan Haschke, Brahim Aissa

We applied hydrogen passivation, gettering and a combination of both to quasi-mono (qm) wafer material to enhance its bulk lifetime and prepared silicon heterojunction (SHJ) solar cells. We find that while our applied hydrogen passivation alone seems not t ...

IEEE2018

Silicon heterojunction solar cells: Recent technological development and practical aspects - from lab to industry

Christophe Ballif, Mathieu Gérard Boccard, Jan Haschke, Olivier Denis Dupré

We review the recent progress of silicon heterojunction (SHJ) solar cells. Recently, a new efficiency world record for silicon solar cells of 26.7% has been set by Kaneka Corp. using this technology. This was mainly achieved by remarkably increasing the fi ...

2018

Nanocrystalline silicon oxide stacks for silicon heterojunction solar cells for hot climates

Christophe Ballif, Mathieu Gérard Boccard, Jean Cattin, Raphaël Monnard, Luca Massimiliano Antognini, Jan Haschke, Brahim Aissa

AIP Publishing2018

Aluminium metallisation for interdigitated back-contact silicon heterojunction solar cells

Jan Haschke

Back-contact silicon heterojunction solar cells with an efficiency of 22% were manufactured, featuring a simple aluminium metallisation directly on the doped amorphous silicon films. Both the open-circuit voltage and the fill factor heavily depend on the p ...

Iop Publishing Ltd2017

Silicon Solar Cells on Glass with Power Conversion Efficiency above 13% at Thickness below 15 Micrometer

Jan Haschke, Natalie Preissler

Liquid phase crystallized silicon on glass with a thickness of (10-40) mu m has the potential to reduce material costs and the environmental impact of crystalline silicon solar cells. Recently, wafer quality open circuit voltages of over 650 mV and remarka ...

Nature Research2017