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Buried contact solar cell using tri-crystalline CZ silicon wafers
Authors:D S Kim  K Y Lee  S H Won  M J Cho  S W Park  S H Lee
Institution:1. Station Engineering Department at American Electric Power, Columbus, OH, United States;2. Electrical and Computer Engineering Department at The Ohio State University, Columbus, OH, United States;3. Operations Department at California ISO, Folsom, CA, United States;4. Electrical and Computer Engineering Department at Arizona State University, Tempe, AZ, United States;1. Institute of Molecular Physics, Polish Academy of Science, PL-60-179 Poznań, Poland;2. Institute of Materials Science, University of Silesia, PL-40-007 Katowice, Poland;1. Geological Survey of Western Australia, 100 Plain Street, East Perth, WA 6004, Australia;2. Centre for Exploration Targeting – Curtin Node, School of Earth and Planetary Science, Bentley, Perth, WA 6102, Australia;3. Petrology Services, Duncraig, WA 6023, Australia;1. Fluminense Federal University, Niterói, Brazil;2. Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;1. Museo de Arqueologia e Etnologia – Universidade de São Paulo, Av. Prof. Almeida Prado 1466, 05588070 São Paulo, Brazil;2. Institute for Archaeological Sciences – University of Tübingen, Rümelinstr. 23, 72070 Tübingen, Germany;3. Senckenberg Center for Human Evolution and Paleoenvironment – University of Tübingen, Rümelinstr. 23, 72070 Tübingen, Germany;4. Department of Human Evolution – Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, 04103 Leipzig, Germany;5. Laboratorio de Estudos Evolutivos e Ecologicos Humanos – Universidade de São Paulo, Rua do Matão 277, 05508090, Brazil;6. Centro de Arqueologia Annette Laming-Emperaire, Rua Acadêmico Nilo Figueiredo 62, 33400-000 Lagoa Santa, Brazil;7. Laboratory for Applied Organic Petrology (LAOP) – Institute for Archaeological Sciences, University of Tübingen, Rümelinstr. 23, 72070 Tübingen, Germany
Abstract:Tri-crystalline silicon wafers have been used for fabrication of buried contact solar cells. Optical properties and microstructures after texturing in KOH solution have been studied and compared with those of multi-crystalline silicon wafers. The textured surface of tri-crystalline wafer has a shape of V-groove with an angle of 109.48°. The efficiency of buried contact solar cell fabricated on tri-crystalline wafer measured to be 14.27% without optimization of cell process for tri-crystalline CZ wafer. Ray tracing computer simulations showed that V-groove composed of (1 1 1) after texturing can decrease reflectance significantly when cells are encapsulated. The reflectance can be reduced to about 4%, averaged over the 400–1100 nm wavelength range. The life time of tri-grain wafer was longer than that of multi-crystalline silicon wafer because it has only three twin boundaries in a wafer.
Keywords:Tri-crystalline silicon  Buried contact solar cell (BCSC)  Encapsulation  Reflectivity
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