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In this paper, we present theoretical and experimental studies of two representative earth-abundant, thin-film solar cell materials: Cu2ZnSnS4 and CH3NH3PbI3. Using first-principles density-functional theory, we show that both Cu2ZnSnS4 and CH3NH3PbI3 exhibit electronic and optical properties that are suitable for solar cell applications. However, the defect physics are rather different in these two...
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