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International Journal of Photoenergy
Volume 2012, Article ID 149210, 7 pages
http://dx.doi.org/10.1155/2012/149210
Research Article

Preparation and Characterization of Cu(In,Ga)Se2 Thin Films by Selenization of Cu0.8Ga0.2 and In2Se3 Precursor Films

Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China

Received 1 August 2012; Accepted 31 October 2012

Academic Editor: Roel van De Krol

Copyright © 2012 Jiang Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Se-containing precursor films with two different compositions were prepared by magnetron sputtering from and targets, and then were selenized using Se vapor. The effects of precursor composition and selenization temperature on the film properties were investigated. The results show that Se phase plays a critical role in film growth and electrical properties of CIGS films. The Cu-rich films exhibit different surface morphology and better crystallinity, as compared to the Cu-poor films. All the CIGS films exhibit p-type conductivity. The resistivity of the Cu-rich films is about three orders of magnitude lower than that of the Cu-poor films, which is attributed to the presence of p-type highly conductive Se phase.