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Velut P.,Ecole Polytechnique Federale de Lausanne | Tween R.,Ecole Polytechnique Federale de Lausanne | Teuscher R.,Ecole Polytechnique Federale de Lausanne | Leterrier Y.,Ecole Polytechnique Federale de Lausanne | And 3 more authors.
International Journal of Sustainable Energy | Year: 2014

A polymer composite material system and a process for encapsulation of thin film solar cells were developed for profiled roofing elements, in view of building-integrated photovoltaic (PV) applications. Amorphous silicon cells were deposited on a polyethylene naphthalate film and encapsulated with additional polymer layers in the form of a flat laminate using industrial processes. The process technology developed in this work included a pre-forming step of the PV laminate and a moulding step of a glass fibre-reinforced polyester composite. These two steps were optimised using thermo-elastic analyses, with attention paid to laminate designs and process windows compatible with the thermo-mechanical limits of the fragile active PV layers. A demonstrator with standard 1.0 m×1.8 m corrugated roofing profile, a weight of 6.3 kg and 60 W of output power was produced. The long-term endurance of the conformal modules was also validated using humidity-freeze, damp-heat and water immersion tests. © 2013 Taylor & Francis. Source


Gonzalez Lazo M.A.,Ecole Polytechnique Federale de Lausanne | Teuscher R.,Ecole Polytechnique Federale de Lausanne | Leterrier Y.,Ecole Polytechnique Federale de Lausanne | Manson J.-A.E.,Ecole Polytechnique Federale de Lausanne | And 5 more authors.
Solar Energy Materials and Solar Cells | Year: 2012

Light-trapping textures were produced in hyperbranched polymer (HBP) silica nanocomposites using a UV-nanoimprint lithography (UVNIL) replication method, either in batch or roll-to-roll processes. The hardness of the HBP was found to increase by a factor of 2.5 with the addition of 50 vol% of nanoparticles. A nickel master with random sub-micron pyramidal structures was used to imprint nanocomposites containing up to 20 vol% of silica on a polyethylene naphthalate (PEN) substrate. The influence of nanoparticle fraction and pressure on the texture morphology and light scattering properties of the replicas was studied using scanning electron microscopy and optical analysis. The roughness and coherence length of the textures were similar to those of the master for all investigated compositions and process pressures. Likewise, the light scattering performance of aluminum-coated texturized nanocomposites was identical to that of the metal template, with a haze of 90% over the 400-800 nm spectral range. Thin film amorphous silicon solar cells were deposited on the texturized substrates using a large-area roll-to-roll process. The photocurrent of these devices was found to be 23% higher than the reference value of a flat cell. © 2012 Elsevier B.V. All rights reserved. Source

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