The carbon substrate in RST Si ribbon technology for solar cells
| Autor: | E. Jolivet, C. Bigot, R. Varrot, J. Chancolon, M. Monville, C. Belouet, Sylvie Bonnamy |
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| Přispěvatelé: | Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), CRLCC Paul Strauss, Institut de génétique et microbiologie [Orsay] (IGM), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Interfaces, Confinement, Matériaux et Nanostructures ( ICMN), Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Fabrication Silicon Composite number chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 7. Clean energy 01 natural sciences Coating Ribbon [CHIM]Chemical Sciences General Materials Science Lamellar structure Composite material ComputingMilieux_MISCELLANEOUS Deposition (law) [PHYS]Physics [physics] General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry engineering 0210 nano-technology Carbon |
| Zdroj: | Carbon Carbon, 2019, 141, pp.427-443. ⟨10.1016/j.carbon.2018.09.049⟩ |
| ISSN: | 0008-6223 |
| Popis: | The carbon substrate used in the RST (silicon Ribbon growth on a Sacrificial carbon Template) process, a silicon ribbon growth technology aimed at the fabrication of silicon solar cells, is a composite made of a compressed expanded natural graphite (CENG) ribbon coated by a protective rough lamellar high-temperature (RLHT) pyrocarbon. It is shown that the reactivity of RLHT pyrocarbon with molten silicon is stimulated by the presence of topological defects of the CENG ribbon. This reactivity generates a contamination of the silicon melt by carbon and its metallic impurities and, in turn, adversely affects the performances of solar cells made from RST silicon films. Reactivity with molten silicon can be drastically reduced by the control of the deposition conditions of pyrocarbon and of the roughness of the CENG ribbon. A new model is proposed to explain the mechanism of the intrinsic reactivity of RLHT pyrocarbon with molten silicon. Based on this model the reactivity problem can virtually be eliminated by the deposition of a SiC coating about 0.3 μm on the RLHT pyrocarbon. Improvements of the carbon ribbon, described in this study, especially its pyrocarbon coating, should lead to flexible silicon solar cells 70–80 μm thick with conversion efficiency above 18%. |
| Databáze: | OpenAIRE |
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