Journal
APPLIED PHYSICS LETTERS
Volume 83, Issue 24, Pages 4924-4926Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1632532
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Electronic mapping of cross sections of a polycrystalline device, the n-CdS/p-CdTe solar cell, show that the photovoltaic and metallurgical junctions coincide to within experimental resolution (50 nm), which rules out both type conversion of CdS and buried homojunctions. Compositional analysis of the CdS supports this. Mapping was done using scanning capacitance, complemented by scanning Kelvin probe microscopy. Our results explain why a high-resistance transparent conducting oxide layer is needed as contact to the CdS for successful device operation. They define limits on inputs for modeling performance of these devices. (C) 2003 American Institute of Physics.
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