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Franz-Josef Haug

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Related publications (108)

Page 4 of 6

Design of periodic nano- and macro-scale textures for high-performance thin-film multi-junction solar cells

Christophe Ballif, Franz-Josef Haug, Etienne Antoine Julien Moulin

Surface textures in thin-film silicon multi-junction solar cells play an important role in gaining the photocurrent of the devices. In this paper, a design of the textures is carried out for the case of amorphous silicon/micro-crystalline silicon (a-Si:H/m ...

Iop Publishing Ltd2016

Development of micromorph tandem soalr cells on flexible low cost plastic substrates

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

We report on the development of fully flexible microcrystalline and micromorph tandem solar cells directly on low-cost substrates like poly-ethylen-terephtalate (PET) and poly-ethylen-naphtalate (PEN). The cells are deposited in nip or nip/nip configuratio ...

2009

Metal versus dielectric back reflector for thin-film Si solar cells with impact of front electrode surface texture

Franz-Josef Haug, Chunmin Zhang, Etienne Antoine Julien Moulin, Jan-Willem Alexander Schüttauf

Thin-film Si solar cells employ a back reflector (BR) for a more efficient use of the long wavelength light. Here, we have carried out a cross evaluation of metal (Ag-based) and dielectric (white paint-based) BR designs. Conclusive results have been reache ...

Wiley-Blackwell2016

Phosphorous-Doped Silicon Carbide as Front-Side Full-Area Passivating Contact for Double-Side Contacted c-Si Solar Cells

Christophe Ballif, Franz-Josef Haug, Matthieu Despeisse, Gizem Nogay, Philipp Friedrich Hermann Löper, Andrea Ingenito, Philippe Wyss, Josua Andreas Stückelberger, Luca Gnocchi

We present an electron selective passivating contact based on a tunneling SiOx capped with a phosphorous doped siliconcarbideandpreparedwithahigh-temperaturethermalanneal. We investigate in detail the effects of the preparation conditions of theSiCx(n)(i.e ...

2018

Stencil-Nanopatterned Back Reflectors for Thin-Film Amorphous Silicon n-i-p Solar Cells

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

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 ...

Ieee-Inst Electrical Electronics Engineers Inc2013

A passivating contact for silicon solar cells formed during a single firing thermal annealing

Christophe Ballif, Franz-Josef Haug, Matthieu Despeisse, Quentin Thomas Jeangros, Andrea Ingenito, Gizem Nogay, Monica Morales Masis, Philipp Friedrich Hermann Löper, Oscar Esteban Rucavado Leandro

Passivating contacts are indispensable for achieving high conversion efficiency in crystalline-silicon solar cells. Their realization and integration into a convenient process flow have become crucial research objectives. Here, we report an alternative pas ...

2018

A low-cost UWB sensor node powered by a piezoelectric harvester or solar cells

Nico de Rooij, Anja Skrivervik, Danick Briand, Pierre-André Farine, Franz-Josef Haug, Cyril Botteron, Pattanaphong Janphuang, Robert Andrew Lockhart, Christian Robert, Gabriele Tasselli

We propose an autonomous battery-less wireless sensor node that combines on a single printed circuit board an ultra-wideband (UWB) transmitter and its printed antenna, together with a piezoelectric cantilever and a solar cell array to harvest vibrations an ...

Elsevier2016

Highly transparent modulated surface textured front electrodes for high-efficiency multijunction thin-film silicon solar cells

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

To further increase the efficiency of multijunction thin-film silicon (TF-Si) solar cells, it is crucial for the front electrode to have a good transparency and conduction, to provide efficient light trapping for each subcell, and to ensure a suitable morp ...

Wiley-Blackwell2015

Increasing the efficiency of silicon heterojunction solar cells and modules by light soaking

Christophe Ballif, Franz-Josef Haug, Antoine Descoeudres, Jacques Levrat, Matthieu Despeisse, Stefaan De Wolf

Silicon heterojunction solar cells use crystalline silicon (c-Si) wafers as optical absorbers and employ bilayers of doped/intrinsic hydrogenated amorphous silicon (a-Si:H) to form passivating contacts. Recently, we demonstrated that such solar cells incre ...

Elsevier Science Bv2017

Influence of the ZnO buffer layer on the guided mode structure in Si/ZnO/Ag multilayers

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

We present a study of the optical mode structure in metal-dielectric multilayer structures that represent amorphous silicon thin film solar cells with metallic back contact. Knowledge of the modal structure represents a first step toward describing absorpt ...

2009

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

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

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

A passivating contact concept compatible with a short thermal treatment

Christophe Ballif, Franz-Josef Haug, Matthieu Despeisse, Andrea Ingenito, Gizem Nogay, Philippe Wyss, Josua Andreas Stückelberger

In this study we present a boron-doped silicon carbide layers as a hole-selective contact which is compatible with short annealing time (typically < 1 minute) as the one used for firing of metal pastes. The application of such layers on symmetrically proce ...

IEEE2018

Surface Defect Passivation of Silicon Micropillars

Anna Fontcuberta i Morral, Franz-Josef Haug, Josua Andreas Stückelberger, Dmitry Mikulik, Pablo Romero Gómez

2018

Boron-emitter development for TOPCon c-Si solar cells based on plasma-deposited boron diffusion source and poly-Si(n) passivating contact

Thibault Schaller, Ludovica Lunghi, Christophe Ballif, Franz-Josef Haug, Julien Hurni, Ezgi Genç

The n-type TOPCon technology is currently the leading approach in the industry. Generally, it involves two high-temperature steps that can result in long cycle times and expensive processes. In this context, we propose a lean manufacturing process based on ...

2025

Solar photovoltaic module

Christophe Ballif, Franz-Josef Haug, Philipp Friedrich Hermann Löper, Philippe Wyss, Josua Andreas Stückelberger

In the present invention a new solar photovoltaic module is proposed comprising a solar cell comprising a silicon layer having a first (1 a) surface and a second surface (1a) opposite to said first surface. The solar cell further comprises a passivating la ...

2017

Fourier light scattering model for treating textures deeper than the wavelength

Christophe Ballif, Franz-Josef Haug, Matthias Wolfgang Bräuninger

We apply a Fourier-scattering model to describe light scattering in solar cells with textured surfaces. For the size and inclination angle of typical micro-textures, scattering may occur into large angles. This makes the model prone to paraxial errors. We ...

Optical Society of America2017

Geometrical Impact on Guided Mode Excitation in Solar Cells

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

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

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

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

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

UV-nano-imprint lithography technique for the replication of back reflectors for n-i-p thin film silicon solar cells

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

Texturing of interfaces in thin film silicon solar cells is essential to enhance the produced photocurrent and thus the efficiencies.AUVnano-imprint-lithography (UV-NIL) replication processwas developed to prepare substrates with textures that are suitable ...

2010