Publications by Martin Python | EPFL Graph Search

Optical and structural analysis of sol-gel derived Cu-Co-Mn-Si oxides for black selective solar nanocomposite multilayered coatings

Aïcha Hessler-Wyser, Pierre Loesch, Martin Python, Andreas Schueler, Thomas Gascou, Yannik Antonetti, Olivia Valérie Charlotte Bouvard, Martin Joly, Marina Aymara González Lazo

In this paper, we report the preparation of the precursor solutions for the deposition of Cu-Co-Mn-Si oxides by a sot-gel method in order to produce black selective coatings for CSP receiver tubes. Their optical properties were investigated by means of spe ...

Elsevier2015

Selective solar absorber coatings on receiver tubes for CSP - energy-efficient production process by sol-gel dip-coating and subsequent induction heating

Aïcha Hessler-Wyser, Jean-Louis Scartezzini, Martin Python, Andreas Schueler, Thomas Gascou, Yannik Antonetti, Martin Joly, Marina Aymara González Lazo

The energy efficiency of production processes for components of solar energy systems is an important issue. Other factors, which are important for the production of black selective solar coatings include production speed, cycle time and homogeneity of the ...

Elsevier Science Bv2014

Novel black selective coating for tubular solar absorbers based on a sol-gel method

Jean-Louis Scartezzini, Martin Python, Andreas Schueler, Thomas Gascou, Yannik Antonetti, Martin Joly, Marina Aymara González Lazo, Marina Garcia Gonzalez

Multi layered chrome-free black selective surfaces for solar thermal energy conversion were produced by a low-cost sol gel dip-coating method. The optical properties of the Cu-Co-Mn-Si-O based nanocrystalline thin films have been characterized by spectroph ...

Elsevier2013

Microcrystalline silicon solar cells: effect of substrate temperature on cracks and their role in post-oxidation

Christophe Ballif, Martin Python, Thomas Söderström

Microcrystalline silicon (mc-Si:H) cells can reach efficiencies up to typically 10% and are usually incorporated in tandem micromorph devices. When cells are grown on rough substrates, ‘‘cracks’’ can appear in the mc-Si:H layers. Previous works have demons ...

2010

Research and developments in thin film silicon photovoltaics

Christophe Ballif, Sylvie Faÿ, Martin Python, Thomas Söderström, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon, Franz-Josef Haug, Matthieu Despeisse

The increasing demand for photovoltaic devices and the associated crystalline silicon feedstock demand scenario have led in the past years to the fast growth of the thin film silicon industry. The high potential for cost reduction and the suitability for b ...

2009

Optical selective coating for solar absorbers

Martin Python, Andreas Schueler, Yannik Antonetti, Martin Joly

Solar thermal energy is generally accepted as very energy efficient in providing space heating and cooling, desalination of sea water or solar thermal electricity generation. For all these applications, one of the key elements is the optical selective coat ...

EPFL2009

MICROCRYSTALLINE SILICON SOLAR CELLS: EFFECT OF SUBSTRATE TEMPERATURE ON CRACKS

Christophe Ballif, Martin Python

Single junction microcrystalline silicon solar cells presently reach confirmed efficiencies up to 10.1%. Further improvement on device quality is now necessary to continuously increase the electrical performances of the solar cells. Zones of porous materia ...

2009

Influence of the substrate geometrical parameters on microcrystalline silicon growth for thin-film solar cells

Christophe Ballif, Martin Python, Omid Madani Ghahfarokhi

The effect of substrate morphology on the growth and electrical properties of single-junction microcrystalline silicon cells is investigated. A large variety of V-shaped and U-shaped substrates are characterized by scanning electron microscopy (SEM) and th ...

2009

Limiting factors in the fabrication of microcrystalline silicon solar cells and microcrystalline/amorphous (‘micromorph’) tandems

Christophe Ballif, Arvind Shah, Martin Python, Andrea Feltrin, Grégory Bugnon

This contribution presents the status of amorphous and microcrystalline silicon solar cells on glass, and discusses some material/fabrication factors that presently limit their conversion efficiency. Particular attention is focused on recent results and de ...

2009

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

Christophe Ballif, Martin Python, Thomas Söderström, Xavier Niquille, Vanessa Terrazzoni-Daudrix, Franz-Josef Haug

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

Quantum dot containing nanocomposite thin films for phtoluminescent solar concentrators

Martin Python, Andreas Schueler, Estelle De Chambrier

Silicon oxide films containing CdS quantum dots have been deposited on glass substrates by a sol–gel dip-coating process. Hereby the CdS nanocrystals are grown during the thermal annealing step following the dip-coating procedure. Total hemispherical trans ...

2007