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New Structural Investigations in the Cu2Se(S)-In2Se3(S)/Cu2Se(S)-Ga2Se3(S) Phase Diagrams

Published online by Cambridge University Press:  31 January 2011

Christiane Stephan ,
Susan Schorr  and
H.W. Schock
Christiane Stephan
Affiliation:
christiane.stephan@helmholtz-berlin.de, Helmholtz-Zentrum Berlin für Materialien und Energie, Materials for Solar Energy, Institute of Technology, Berlin, Germany
Susan Schorr
Affiliation:
susan.schorr@helmholtz-berlin.de, Free University of Berlin, Department of Geoscience, Berlin, Germany
H.W. Schock
Affiliation:
hans-werner.schock@helmholtz-berlin.de, Helmholtz-Zentrum Berlin für Materialien und Energie, Materials for Solar Energy, Institute of Technology, Berlin, Germany
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Abstract

Non-stoichiometry is a characteristic feature of ternary chalcopyrites like Cu-III-VI2 (III=In,Ga; VI=S,Se). The results of a comparative study of structural trends within the homogeneity region of the chalcopyrite type α-phase of the Cu2Se(S)-In2Se3(S) and Cu2Se(S)-Ga2Se3(S) quasibinary phase diagrams are presented. Powder samples of Cu-rich and Cu-poor [Cu2Se(S)]1-y-[In2Se3(S)]y as well as [Cu2Se(S)]1-y-[Ga2Se3(S)]y alloys were prepared (0.4<y<0.6) by solid state reaction of the elements (T=850°C) and investigated by X-ray powder diffraction and electron microprobe analysis. It was shown that the grain size depends on composition and structural parameters. The tetragonal distortion η=c/2a has been determined for the different trivalent cations and influences the microstructure in Cu-poor Cu1-xIII1+x/3VI2 samples. In Cu-rich samples the Cu-content is in all cases the driving force for the formation of the homogeneous microstructure observed.

Keywords

x-ray diffraction (XRD)photovoltaicmicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1165: Symposium M – Thin-Film Compound Semiconductor Photovoltaics–2009 , 2009 , 1165-M09-08
Copyright
Copyright © Materials Research Society 2009

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