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Chemical and Electronic Properties of Metal/Sb2Te3/CdTe Contacts for CdTe Thin Film Solar Cells Studied by Photoelectron Spectroscopy

Published online by Cambridge University Press:  01 February 2011

D. Kraft ,
B. Späth ,
A. Thißen ,
A. Klein  and
W. Jaegermann
D. Kraft
Affiliation:
Surface Science Division, Department of Materials Science, Darmstadt University of Technology, Petersenstr. 23, D-64287 Darmstadt, Germany
B. Späth
Affiliation:
Surface Science Division, Department of Materials Science, Darmstadt University of Technology, Petersenstr. 23, D-64287 Darmstadt, Germany
A. Thißen
Affiliation:
Surface Science Division, Department of Materials Science, Darmstadt University of Technology, Petersenstr. 23, D-64287 Darmstadt, Germany
A. Klein
Affiliation:
Surface Science Division, Department of Materials Science, Darmstadt University of Technology, Petersenstr. 23, D-64287 Darmstadt, Germany
W. Jaegermann
Affiliation:
Surface Science Division, Department of Materials Science, Darmstadt University of Technology, Petersenstr. 23, D-64287 Darmstadt, Germany
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Abstract

Formation of low resistance back contacts in CdTe thin film solar cells has been a research issue for many years. Ohmic contacts to the absorber layer are typically prepared using the diffusion of dopant atoms from the back contact material into the CdTe forming a thin space charge layer that can be easily tunnelled. Stable CdTe solar cells with reasonable back contact characteristics have been prepared using metal/Sb2Te3 layer sequences. In this study the chemical and electronic properties of such layer systems have been investigated using photoelectron spectroscopy. The vacuum deposited Sb2Te3 layers do not react with the CdTe substrate. Band alignment does not indicate the formation of a good back contact. By subsequent deposition of metals a chemical reaction is induced forming metal-tellurides, a metal/Sb-alloy and elemental Sb. Although an Sb diffusion into the CdTe absorber is observed, no increase of p-doping in the surface region is evident.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 763: Symposium B – Compound Semiconductor Photovoltaics , 2003 , B3.3
Copyright
Copyright © Materials Research Society 2003

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