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Christophe Ballif

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Related publications (443)

Copper and transparent-conductor reflectarray elements on thin-film solar cell Panels

Christophe Ballif, Julien Perruisseau-Carrier, Sylvain Nicolay, Monica Morales Masis

This work addresses the task of integrating reflectarray antennas on thin-film solar cell panels, as a means to save real estate, weight or cost of platforms, such as satellites or transportable autonomous antenna systems. Reflectarray unit cell families, ...

Institute of Electrical and Electronics Engineers2014

Light-induced Voc increase and decrease in high-efficiency amorphous silicon solar cells

Christophe Ballif, Franz-Josef Haug, Matthieu Despeisse, Michael Elias Stückelberger, Yannick Samuel Riesen, Jan-Willem Alexander Schüttauf

High-efficiency amorphous silicon (a-Si:H) solar cells were deposited with different thicknesses of the p-type amorphous silicon carbide layer on substrates of varying roughness. We observed a light-induced open-circuit voltage (Voc) increase upon light so ...

American Institute of Physics2014

Tailoring the surface morphology of zinc oxide films for high-performance micromorph solar cells

Christophe Ballif, Laura Ding, Sylvain Nicolay, Lorenzo Fanni, Monica Morales Masis

Self-textured zinc oxide polycrystalline films prepared by metalorganic low-pressure chemical vapor deposition combine excellent transparency, conductivity and light-scattering ability when used as electrodes for high-efficiency thin-film silicon solar cel ...

Elsevier2014

Self-Patterned Nanoparticle Layers for Vertical Interconnects: Application in Tandem Solar Cells

Christophe Ballif, Aïcha Hessler-Wyser, Fanny Sculati-Meillaud, Nicolas Blondiaux, Raphaël Pugin, Franz-Josef Haug, Mathieu Gérard Boccard, Michael Elias Stückelberger, Emmanuel Scolan, Björn Niesen

We demonstrate self-patterned insulating nanoparticle layers to define local electrical interconnects in thin-film electronic devices. We show this with thin-film silicon tandem solar cells, where we introduce between the two component cells a solution-pro ...

American Chemical Society2014

Solar cell

Christophe Ballif

The present invention relates to a solar cell comprising a semiconductor wafer (1), an emitter formed by at least one emitter region (20) which comprises at least a first layer (3) of a first conductivity type and a first contact layer (4) allowing a carri ...

2014

Optical properties of anodically degraded ZnO

Christophe Ballif, Sylvain Nicolay

We discuss the optical properties of non-degraded and anodically degraded boron-doped zinc oxide (ZnO:B) deposited by low-pressure chemical vapour deposition on soda-lime glass. The optical model used to simulate the infrared reflectance in the wavelength ...

American Institute of Physics2014

Organic-Inorganic Halide Perovskites: Perspectives for Silicon-Based Tandem Solar Cells

Christophe Ballif, Jun Ho Yum, Soo-Jin Moon, Stefaan De Wolf, Franz-Josef Haug, Jakub Holovsky, Björn Niesen, Martin Ledinsky

We investigate the efficiency potential of organic-inorganic halide perovskite/crystalline silicon tandem solar cells, a new class of photovoltaic devices targeting long-term cost reductions by ultrahigh conversion efficiencies. Methyl ammonium lead triiod ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Low-temperature plasma-deposited silicon epitaxial films: Growth and properties

Christophe Ballif, Bénédicte Demaurex, Quentin Thomas Jeangros, Duncan Thomas Lindsay Alexander, Stefaan De Wolf, Johannes Peter Seif

Low-temperature (

American Institute of Physics2014

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

Is light-induced degradation of a-Si:H/c-Si interfaces reversible?

Christophe Ballif, Bénédicte Demaurex, Stefaan De Wolf, El Mahdi El Mhamdi, Jakub Holovsky

Thin hydrogenated amorphous silicon (a-Si:H) films deposited on crystalline silicon (c-Si) surfaces are sensitive probes for the bulk electronic properties of a-Si:H. Here, we use such samples during repeated low-temperature annealing and visible-light soa ...

AIP American Institute of Physics2014

Light trapping in thin-film solar cells measured by Raman spectroscopy

Christophe Ballif, Grégory Bugnon, Etienne Antoine Julien Moulin, Martin Ledinsky

In this study, Raman spectroscopy is used as a tool to determine the light-trapping capability of textured ZnO front electrodes implemented in microcrystalline silicon (mu c-Si:H) solar cells. Microcrystalline silicon films deposited on superstrates of var ...

American Institute of Physics2014

Class AAA LED-Based Solar Simulator for Steady-State Measurements and Light Soaking

Christophe Ballif, Brice Perruche, Franz-Josef Haug, Matthieu Despeisse, Michael Elias Stückelberger, Yannick Samuel Riesen, Maximilien Joseph Marie Bonnet-Eymard

Recent improvements in light-emitting diode (LED) technology has allowed for the use of LEDs for solar simulators with excellent characteristics. In this paper, we present a solar simulator prototype fully based on LEDs. Our prototype has been designed spe ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Atomic-Layer-Deposited Transparent Electrodes for Silicon Heterojunction Solar Cells

Christophe Ballif

We examine damage-free transparent-electrode deposition to fabricate high-efficiency amorphous silicon/crystalline silicon heterojunction solar cells. Such solar cells usually feature sputtered transparent electrodes, the deposition of which may damage the ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Post-deposition treatment of microcrystalline silicon solar cells for improved performance on rough superstrates

Christophe Ballif, Laura Ding, Sylvain Nicolay, Grégory Bugnon, Mathieu Gérard Boccard

In this contribution, we investigate the effect of post-deposition treatments on finished non-encapsulated thin-film microcrystalline silicon solar cells and show that annealing in vacuum leads to improved electrical properties of the solar cells, particul ...

American Institute of Physics2014

Scanning Laser-Beam-Induced Current Measurements of Lateral Transport Near-Junction Defects in Silicon Heterojunction Solar Cells

Christophe Ballif, Antoine Descoeudres, Stefaan De Wolf

We report the results of scanning laser-beam-induced current (LBIC) measurements on silicon heterojunction solar cells that indicate the length scale over which photogenerated carriers are sensitive to local defects at the amorphous silicon/crystalline sil ...

Ieee-Inst Electrical Electronics Engineers Inc2014

Silicon heterojunction solar cell with passivated hole selective MoOx contact

Christophe Ballif, Stefaan De Wolf, Corsin Battaglia

We explore substoichiometric molybdenum trioxide (MoOx, x < 3) as a dopant-free, hole-selective contact for silicon solar cells. Using an intrinsic hydrogenated amorphous silicon passivation layer between the oxide and the silicon absorber, we demonstrate ...

American Institute of Physics2014

Thin-film limit formalism applied to surface defect absorption

Christophe Ballif, Jakub Holovsky

The thin-film limit is derived by a nonconventional approach and equations for transmittance, reflectance and absorptance are presented in highly versatile and accurate form. In the thin-film limit the optical properties do not depend on the absorption coe ...

Optical Society of America2014

Thin-Film Silicon Triple-Junction Solar Cells on Highly Transparent Front Electrodes With Stabilized Efficiencies up to 12.8%

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

High-efficiency thin-film silicon triple-junction solar cells in p-i-n configuration have been fabricated using amorphous silicon top cell absorber layers, as well as microcrystalline silicon middle and bottom cell absorbers. The triple-junction cells were ...

Ieee-Inst Electrical Electronics Engineers Inc2014

c-texture versus a-texture low pressure metalorganic chemical vapor deposition ZnO films: Lower resistivity despite smaller grain size

Christophe Ballif, Laura Ding, Sylvain Nicolay, Arthur Brian Aebersold, Duncan Thomas Lindsay Alexander, Lorenzo Fanni, Monica Morales Masis

Recently, it has been shown that it is possible to tune the morphology of zinc oxide films deposited by low-pressure metalorganic chemical vapor deposition (LP-MOCVD) while preserving good electrical conductivity. Here a closer look is taken at films depos ...

Elsevier2014

Organometallic Halide Perovskites: Sharp Optical Absorption Edge and Its Relation to Photovoltaic Performance

Christophe Ballif, Jun Ho Yum, Soo-Jin Moon, Stefaan De Wolf, Franz-Josef Haug, Jakub Holovsky, Björn Niesen, Martin Ledinsky

Solar cells based on organometallic halide perovskite absorber layers are emerging as a high-performance photovoltaic technology. Using highly sensitive photothermal deflection and photocurrent spectroscopy, we measure the absorption spectrum of CH3NH3PbI3 ...

Amer Chemical Soc2014

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