TITLE

High-resolution mapping of nonuniform carrier transport at contacts to polycrystalline CdTe/CdS solar cells

AUTHOR(S)
Sutter, P.; Sutter, E.; Ohno, T. R.
PUB. DATE
March 2004
SOURCE
Applied Physics Letters;3/22/2004, Vol. 84 Issue 12, p2100
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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[sup +]-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. © 2004 American Institute of Physics.
ACCESSION #
12530499

 

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