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James Sites studies the device physics of low-cost CdTe and CIGS thin-film solar cells. He received his PhD from Cornell in 1969 and has been on the Colorado State Physics faculty since 1971. His photovoltaics lab makes precision electrical and optical measurements on solar cells fabricated at Colorado State and by several partners in the U.S. and abroad. The goals of his laboratory are to separate the various solar-cell losses, to explain the losses on a fundamental basis, to make numerical simulations when appropriate, and to suggest strategies for improved solar-cell performance.