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Abstract
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| Ultimately, alternative ways of silicon purification for photovoltaic applications are developed and applied. There is an ongoing debate about what are the acceptable contamination levels within the purified silicon feedstock to specify the material as solar grade silicon. We present a model to determine the acceptable contamination levels of different characteristic impurities for each fabrication step of a typical industrial solar cell. The acceptable impurity concentrations within the finished solar cell are calculated for SRH recombination exclusively and under low injection conditions. It is assumed that during solar cell fabrication impurity concentrations and activities are altered by a gettering step and other typical thermal steps. During the crystallization process, impurity segregation at the solid-liquid interface is taken into account. Finally, the initial contamination levels allowed within the feedstock are deduced | |
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International
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Si |
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Congress
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European Materials Research Society Spring Meeting. Simposium K: ADvanced Silicon Materials Research for Electronic And Photovoltaic Applications |
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960 |
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Place
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Strasbourg, France |
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Reviewers
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Si |
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ISBN/ISSN
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00-0000-0000 |
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Start Date
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26/05/2008 |
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End Date
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30/05/2008 |
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From page
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299 |
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To page
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304 |
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Materials Science and Engineering B |