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Real-time Investigations on the Formation of CuIn(S,Se)2 while annealing precursors with varying sulfur content

Published online by Cambridge University Press:  31 January 2011

Astrid Hölzing ,
Roland Schurr ,
Stefan Jost ,
Jörg Palm ,
Klaus Deseler ,
Peter J. Wellmann  and
Rainer Hock
Astrid Hölzing
Affiliation:
[email protected], Chair for Crystallography and Structural Physics, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
Roland Schurr
Affiliation:
[email protected], Chair for Crystallography and Structural Physics, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
Stefan Jost
Affiliation:
[email protected], AVANCIS GmbH & Co. KG, München, Germany
Jörg Palm
Affiliation:
[email protected], AVANCIS GmbH & Co. KG, München, Germany
Klaus Deseler
Affiliation:
[email protected], Department of Materials Science 6, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
Peter J. Wellmann
Affiliation:
[email protected], Department of Materials Science 6, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
Rainer Hock
Affiliation:
[email protected], Chair for Crystallography and Structural Physics, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
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Abstract

CIS based chalcopyrite absorber materials are usually substituted in the cation and anion lattice to yield mixed pentanary crystals with the general composition Cu(In,Ga)(Se,S)2 to achieve an optimised adaptation of the semiconductor bandgap to the terrestrial solar spectrum. Real-time investigations during the annealing of stacked elemental layers (SEL) of sputtered metals Cu and In and evaporated chalcogens S and Se with varying ratios were performed by angle-dispersive time-resolved XRD (X-ray diffraction) measurements. After qualitative phase analysis the measured powder diagrams were quantitatively analysed by the Rietveld method, the phases formed determined and their reaction kinetics obtained. Ternary indium and copper sulfoselenides form by the sulfoselenisation of the intermetallic alloy yielding different educts for the chalcopyrite formation with varying sulfur content. For S/(S+Se) ≥ 0.5 the formation of the chalcopyrite CuIn(S,Se)2 is similar to the crystallisation path of CuInS2. With increasing amount of selenium (S/(S+Se) = 0.25) different ternary sulfoselenides contribute to the semiconductor formation. For small amounts of sulfur, i.e. S/(S+Se) ≤ 0.1, the chalcopyrite crystallisation proceeds comparable to the one observed for sulfur-free Cu-In-Se precursors. The formation of CuIn(S,Se)2 is accelerated and proceeds mainly after the peritectic decomposition of Cu(S,Se) to Cu2(S,Se). The sulfur content determines the crystallisation temperature of the semiconductor because Cu(S,Se) decomposes at higher temperatures with increasing sulfur. Upon heating S ↔ Se exchange reactions take place in the Cu-S-Se and Cu-In-S-Se system.

Keywords

phase transformationmixturethin film
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1165: Symposium M – Thin-Film Compound Semiconductor Photovoltaics–2009 , 2009 , 1165-M02-02
Copyright
Copyright © Materials Research Society 2009

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