DocumentCode :
268179
Title :
Surface Off-Stoichiometry of CuInS 
Thin-Film Solar Cell Absorbers
Author :
Bär, M. ; Klaer, J. ; FeÌlix, R. ; Barreau, N. ; Weinhardt, L. ; Wilks, R.G. ; Heske, C. ; Schock, H.-W.
Author_Institution :
Solar Energy Div., Helmholtz-Zentrum Berlin fur Mater. und Energie GmbH, Berlin, Germany
Volume :
3
Issue :
2
fYear :
2013
fDate :
Apr-13
Firstpage :
828
Lastpage :
832
Abstract :
In this paper, X-ray photoelectron and X-ray-excited Auger electron spectroscopy was used to investigate the chemical surface structure of CuInS2 thin-film solar cell absorbers. We find that the [In]/[Cu] surface composition can vary between 1.6 (± 0.4) and 3.7 (± 0.7), depending on relatively minor variations in the absorber formation process and/or whether additional wet-chemical treatments are performed. These variations are primarily due to differences in the Cu surface concentration. The corresponding change of the modified In Auger parameter is interpreted as being indicative of a change in the chemical environment of In as a function of Cu off-stoichiometry.
Keywords :
Auger electron spectra; X-ray photoelectron spectra; chemical structure; copper compounds; indium compounds; semiconductor thin films; solar absorber-convertors; solar cells; stoichiometry; surface chemistry; surface composition; ternary semiconductors; thin film devices; Auger parameter; CuInS2; X-ray photoelectron spectroscopy; X-ray-excited Auger electron spectroscopy; absorber formation process; chemical environment; chemical surface structure; surface composition; surface concentration; surface off-stoichiometry; thin-film solar cell absorbers; wet-chemical treatments; Chemicals; Photonic band gap; Photovoltaic cells; Spectroscopy; Surface structures; Surface treatment; Water; Chalcopyrite thin-film solar cell; X-ray photoelectron spectroscopy; surface composition; wet-chemical treatment;
fLanguage :
English
Journal_Title :
Photovoltaics, IEEE Journal of
Publisher :
ieee
ISSN :
2156-3381
Type :
jour
DOI :
10.1109/JPHOTOV.2012.2228299
Filename :
6380521
Link To Document :
