期刊
APPLIED PHYSICS LETTERS
卷 85, 期 17, 页码 3854-3856出版社
AMER INST PHYSICS
DOI: 10.1063/1.1809271
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Using near-field optical beam induced current, we spatially resolve the photocurrent in polycrystalline CdTe/CdS solar cells, and observe increased photocurrent collection at grain boundaries (relative to the intragrain volume). This observation supports previously reported hypotheses that grain boundaries present a hole-barrier, thereby assisting in charge separation at the grain boundaries in these devices. The results offer compelling evidence, in an actual working-device structure, of the role of grain boundaries in explaining the surprisingly high performance of these highly defected devices. (C) 2004 American Institute of Physics.
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