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CdTe Thin Film Solar Cells: The CdS/SnO2 Front Contact

Published online by Cambridge University Press:  21 March 2011

J. Fritsche ,
S. Gunst ,
A. Thiβen ,
R. Gegenwart ,
A. Klein  and
W. Jaegermann
J. Fritsche
Affiliation:
Institute of Materials Science, Darmstadt University of TechnologyPetersenstrasse 23, 64287 Darmstadt, Germany
S. Gunst
Affiliation:
Institute of Materials Science, Darmstadt University of TechnologyPetersenstrasse 23, 64287 Darmstadt, Germany
A. Thiβen
Affiliation:
Institute of Materials Science, Darmstadt University of TechnologyPetersenstrasse 23, 64287 Darmstadt, Germany
R. Gegenwart
Affiliation:
ANTEC Technology GmbH Arnstädter Str. 22, D-99334 Rudisleben/Thür., Germany
A. Klein
Affiliation:
Institute of Materials Science, Darmstadt University of TechnologyPetersenstrasse 23, 64287 Darmstadt, Germany
W. Jaegermann
Affiliation:
Institute of Materials Science, Darmstadt University of TechnologyPetersenstrasse 23, 64287 Darmstadt, Germany
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Abstract

Tin dioxide (SnO2) coated glass is the commonly used substrate for thin film solar cells based on CdTe absorbers. We have investigated the properties of the CdS/SnO2 interface by X-ray and ultraviolet photoelectron spectroscopy. SnO2 coated glass substrates as used for solar cell preparation were cleaned by different procedures such as derinsing, sputtering, heating and annealing in oxygen atmosphere. Different surface properties with a strongly dependent number of defects in the SnO2 band gap are identified. CdS films were deposited stepwise by thermal evaporation to determine the electronic interface properties for different surface preparation conditions. Comparative barrier heights at the CdSSnO2 contact are found for most surface pretreatments. The Fermi level position in these cases is situated in the SnO2 band gap. A different interface behaviour is determined for sputter cleaned SnO2 surfaces, which is attributed to the formation of oxygen vacancies during sputtering and subsequent formation of an interfacial SnOxSy compound.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 668: Symposium H – II-IV Compound Semiconductor Photovoltaic Materials , 2001 , H5.1
Copyright
Copyright © Materials Research Society 2001

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References

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