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Franz-Josef Haug

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Publications associées (113)

Light trapping in solar cells at the extreme coupling limit

Christophe Ballif, Hans Peter Herzig, Franz-Josef Haug, Ali Naqavi, Corsin Battaglia

We calculate the maximal absorption enhancement obtainable by guided mode excitation in a weakly absorbing dielectric slab over wide wavelength ranges. The slab mimics thin film silicon solar cells in the low absorption regime. We consider simultaneously w ...

Optical Soc Amer2013

Comparison of amorphous silicon absorber materials: Light-induced degradation and solar cell efficiency

Christophe Ballif, Grégory Bugnon, Franz-Josef Haug, Matthieu Despeisse, Michael Elias Stückelberger, Jan-Willem Alexander Schüttauf

Several amorphous silicon (a-Si:H) deposition conditions have been reported to produce films that degrade least under light soaking when incorporated into a-Si:H solar cells. However, a systematic comparison of these a-Si:H materials has never been present ...

American Institute of Physics2013

Combined model of non-conformal layer growth for accurate optical simulation of thin-film silicon solar cells

Martial Duchamp, Franz-Josef Haug

In thin-film silicon solar cells textured interfaces are introduced, leading to improved antireflection and light trapping capabilities of the devices. Thin-layers are deposited on surface-textured substrates or superstrates and the texture is translated t ...

Elsevier Science Bv2013

Limit of light coupling strength in solar cells

Christophe Ballif, Hans Peter Herzig, Toralf Scharf, Franz-Josef Haug, Ali Naqavi

We introduce a limit for the strength of coupling light into the modes of solar cells. This limit depends on both a cell’s thickness and its modal properties. For a cell with refractive index n and thickness d, we obtain a maximal coupling rate of $2c\sqrt ...

American Institute of Physics2013

Plasmonic silicon solar cells: impact of material quality and geometry

Christophe Ballif, Céline Pahud, Hans Peter Herzig, Franz-Josef Haug, Ali Naqavi

We study n-i-p amorphous silicon solar cells with light-scattering nanoparticles in the back reflector. In one configuration, the particles are fully embedded in the zinc oxide buffer layer; In a second configuration, the particles are placed between the b ...

Optical Society of America2013

Geometrical Impact on Guided Mode Excitation in Solar Cells

Christophe Ballif, Hans Peter Herzig, Karin Söderström, Franz-Josef Haug, Ali Naqavi

We investigate the influence of patterned metallic back reflector on absorption in thinfilm silicon photovoltaics. The impact of symmetry, periodicity, and angle of incidence of light is discussed by simulation and experiment. ...

2012

Influence of the ZnO buffer on the guided mode structure in Si/ZnO/Ag multilayers (vol 106, 044502, 2009)

Christophe Ballif, Vanessa Terrazzoni-Daudrix, Franz-Josef Haug

2012

Light trapping in solar cells: can periodic beat random?

Christophe Ballif, Marco Cantoni, Mathieu Charrière, Karin Söderström, Duncan Thomas Lindsay Alexander, Franz-Josef Haug, Mathieu Gérard Boccard, Matthieu Despeisse, Corsin Battaglia, Jordi Escarre Palou

Theory predicts that periodic photonic nanostructures should outperform their random counterparts in trapping light in solar cells. However, the current certified world-record conversion efficiency for amorphous silicon thin-film solar cells, which strongl ...

2012

UV imprinting for thin film solar cell application

Christophe Ballif, Céline Pahud, Franz-Josef Haug, Corsin Battaglia, Jordi Escarre Palou, Rémi Biron

UV imprinting is an interesting, low cost technique to produce large area thin film solar cells incorporating nanometric textures. Here, we review and present new results confirming that replicas of the most common textures used in photovoltaics can be obt ...

2012

Improvement of the open circuit voltage by modifying the transparent ITO front electrode in amorphous n-i-p solar cells

Christophe Ballif, Jonathan Besuchet, Gilles Kratzer, Frank Jonathan Leresche, Franz-Josef Haug, Rémi Biron

At the front contact of thin film silicon solar cells, the junction between the p-doped window layer and the n-type transparent electrode results in a barrier that must be surmounted by the charge carriers. The barrier height is governed by the work functi ...

Wiley-Blackwell2012

Geometric light trapping for high efficiency thin film silicon solar cells

Christophe Ballif, Laura Ding, Sylvain Nicolay, Grégory Bugnon, Franz-Josef Haug, Matthieu Despeisse, Corsin Battaglia, Jordi Escarre Palou

The imprinting of random square based pyramidal textures with micrometric scale at the air/glass interface of thin film silicon solar cells is presented as an efficient alternative to anti-reflective coatings to minimize reflection losses at the cell entra ...

Elsevier2012

Diffraction and absorption enhancement from textured back reflectors of thin film solar cells

Christophe Ballif, Franz-Josef Haug, Ali Naqavi

We study light scattering and absorption in thin film solar cells, using a model system of a sinusoidally textured silver reflector and dielectric layers of ZnO and amorphous silicon. Experimental results are compared to a theoretical model based on a Rayl ...

American Institute of Physics2012

Stencil-nanopatterned back reflectors for thin-film amorphous silicon n-i-p solar cells

Christophe Ballif, Céline Pahud, Jürgen Brugger, Oscar Vazquez Mena, Andreea Veronica Savu, Mona Julia Katharina Klein, Franz-Josef Haug

We fabricated amorphous silicon n-i-p solar cells with two types of nanopatterned back reflectors using stencil lithography. One reflector type has a plasmonic grating that is embedded in the ZnO layer; the other one has a metallic grating patterned on top ...

Ieee2012

High-Efficiency Amorphous Silicon Solar Cell on a Periodic Nanocone Back Reflector

Christophe Ballif, Céline Pahud, Franz-Josef Haug, Corsin Battaglia

An amorphous silicon solar cell on a periodic nanocone back reflector with a high 9.7% initial conversion efficiency is presented. The optimized back-reflector morphology provides powerful light trapping and enables excellent electrical cell performance. U ...

2012

Solar cell and its production process

Christophe Ballif, Franz-Josef Haug

The present invention relates to a solar cell comprising a support (6), a back electrode layer (5), at least a hydrogenated microcrystalline silicon photoelectric device (9), and a top electrode layer (11). The back electrode layer (5) has a rough surface. ...

2011

High fidelity transfer of nanometric random textures by UV embossing for thin film solar cells applications

Christophe Ballif, Karin Söderström, Franz-Josef Haug, Corsin Battaglia, Jordi Escarre Palou

We investigate the transfer of random nanostructures commonly used in thin film silicon solar cells onto inexpensive substrates, such as glass or flexible polyethylene sheets. Morphological and optical analyses of masters and replicas show the successful t ...

Elsevier2011

Window layer with p doped silicon oxide for high V-oc thin-film silicon n-i-p solar cells

Christophe Ballif, Céline Pahud, Franz-Josef Haug, Jordi Escarre Palou, Rémi Biron

We investigate the influence of the oxygen content in boron-doped nanocrystalline silicon oxide films (p-nc-SiOx) and introduce this material as window layer in n-i-p solar cells. The dependence of both, optical and electrical properties on the oxygen cont ...

American Institute of Physics2011

Enhancement of microcrystalline n-i-p solar cell performance via use of pre-covering layers and H-2 treatment

Christophe Ballif, Xavier Niquille, Vanessa Terrazzoni-Daudrix, Franz-Josef Haug

We study the effects of a-Si:H and mu c-Si:H covering layers and an H-2 treatment on the characteristics of mu c-Si:H thin film solar cells deposited in open single chamber very high frequency plasma enhanced chemical vapor deposition systems. Secondary io ...

Elsevier2011

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

Christophe Ballif, Karin Söderström, Franz-Josef Haug, 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

Excitation of plasmon and guided-mode resonances in thin film silicon solar cells

Franz-Josef Haug

Thin film silicon solar cells are an attractive option for the production of sustainable energy but their low response at long wavelengths requires additional measures for absorption enhancement. The most successful concepts are based on light scattering i ...

2011

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