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Cu 2−x S Surface Phases and Their Impact on the Electronic Structure of CuInS 2 Thin Films – A Hidden Parameter in Solar Cell Optimization

  • The surface properties of CuInS 2 (CIS) thin-fi lm solar cell absorbers are investigated by a combination of electron and soft X-ray spectroscopies. Spatially separated regions of varying colors are observed and identifi ed to be dominated by either CuS or Cu 2 S surface phases. After their removal by KCN etching, the samples cannot be distinguished by eye and the CIS surface is found to be Cu-defi cient in both regions. However, a signifi cantly more pronounced off-stoichiometry in the region initially covered by Cu 2 S can be identifi ed. In this region, the resulting surface band gap is also signifi cantly larger than the E g Surf of the initially CuS-terminated region. Such variations may represent a hidden parameter which, if overlooked, induces irreproducibility and thus prevents systematic optimization efforts.

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Author: Marcus Bär, Joachim Klaer, Lothar Weinhardt, Regan G. Wilks, Stefan Krause, Monika Blum, Wan Li Yang, Clemens Heske, Hans-Werner Schock
ISSN:1614-6840
Title of the source (English):Advanced Energy Materials
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2013
Volume/Year:3
Issue number:6
First Page:777
Last Page:781
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / JP Photovoltaik
Institution name at the time of publication:Fakultät für Mathematik, Naturwissenschaften und Informatik (eBTU) / JP Photovoltaik
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