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The Effect of Film Composition on the Texture and Grain Size of CuInS2 Prepared by Chemical Spray Pyrolysis

Published online by Cambridge University Press:  01 February 2011

Michael H.-C. Jin ,
Kulbinder K. Banger ,
Jerry D. Harris  and
Aloysius F. Hepp
Michael H.-C. Jin
Affiliation:
Ohio Aerospace Institute, 22800 Cedar Point Road, Brookpark, OH 44142, U.S.A. NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, U.S.A.
Kulbinder K. Banger
Affiliation:
Ohio Aerospace Institute, 22800 Cedar Point Road, Brookpark, OH 44142, U.S.A. NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, U.S.A.
Jerry D. Harris
Affiliation:
Dept. of Chemistry, Cleveland State University, Cleveland, OH 44115, U.S.A. NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, U.S.A.
Aloysius F. Hepp
Affiliation:
NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, U.S.A.
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Abstract

Ternary single-source precursors were used to deposit CuInS2 thin films using chemical spray pyrolysis. We investigated the effect of the film composition on texture, secondary phase formation, and grain size. Films with either (112)- or (204/220)-preferred orientation were deposited with most often In-rich composition. The (112)-preferred orientation became more pronounced as the film composition became more In-poor. Films with a (204/220)-preferred orientation were both In-rich and contained a yet unidentified secondary phase. The phase was evaluated as an In-rich compound based on composition analysis and Raman spectroscopy. Further experiments showed that the phase could be removed by depositing a thin Cu layer prior to the growth of CuInS2. Similarly, as-grown Cu-rich (112)-oriented films did not exhibit the In-rich compound. The (204/220) preferred orientation of the film is likely related to the equivalent symmetry between planes of CuInS2 and the In-rich compound. The largest grain size (∼ 0.5μm) was achieved with Cu-rich (112)-oriented films.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 763: Symposium B – Compound Semiconductor Photovoltaics , 2003 , B8.23
Copyright
Copyright © Materials Research Society 2003

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