Journal
APPLIED PHYSICS LETTERS
Volume 84, Issue 12, Pages 2100-2102Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1688997
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We demonstrate a spectroscopic technique based on scanning tunneling microscopy that provides high-resolution maps of local carrier transport across contacts to polycrystalline thin-film solar cells. Using this technique, preferential transport channels across a p(+)-ZnTe/p-CdTe back contact of a p-CdTe/n-CdS solar cell are imaged with 20 nm spatial resolution. Transport across this contact is highly nonuniform. Large areas of high resistance coexist with nanoscale low-resistance regions that are strongly correlated with grain boundaries in the CdTe absorber. These results suggest an important role of grain boundaries as near-contact conducting channels. (C) 2004 American Institute of Physics.
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