Metal-silicon reaction rates—the effects of capping |
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Authors: | Victor G. Weizer Navid S. Fatemi |
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Affiliation: | (1) NASA Lewis Research Center, 44135 Cleveland, Ohio;(2) Sverdrup Technology, Inc., 44130 Middleburg Hts., Ohio |
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Abstract: | Evidence is presented showing that the presence of the commonly used anti-reflection coating material Ta2O5 on the free surface of contact metallization can either suppress or enhance, depending on the system, the interaction that takes place at elevated temperatures between the metallization and the underlying Si. The cap layer is shown to suppress both the generation and annihilation of vacancies at the free surface of the metal which are necessary to support metal-Si interactions. Evidence is also presented indicating that the mechanical condition of the free metal surface has a significant effect on the metal-silicon reaction rate. |
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Keywords: | Ta2O5 metal-Si reaction solar cells |
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