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Advances in Materials Science and Engineering
Volume 2012 (2012), Article ID 136092, 6 pages
http://dx.doi.org/10.1155/2012/136092
Research Article

Segregation of Cu-In-S Elements in the Spray-Pyrolysis-Deposited Layer of CIS Solar Cells

Department of Electric Engineering and Computer Sciences and Department of Materials Science and Chemistry, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan

Received 31 March 2012; Revised 4 October 2012; Accepted 11 October 2012

Academic Editor: Ru-Yuan Yang

Copyright © 2012 Seigo Ito and Toshihiro Ryo. 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

We report the fabrication of superstrate-structured solar cells by the deposition of Cu-In-S (CIS) films on under air by spray pyrolysis. The cells had an open-circuit voltage of 0.551 V, a photocurrent density of 9.5 mA/cm2, a fill factor of 0.45, and a conversion efficiency of 2.14%. However, transmission electron microscopy/energy dispersive X-ray (TEM-EDX) analysis revealed significant differences between the atomic ratio of the setting material in the spray-deposition solution and the elements in the layer. Moreover, TEM-EDX measurements suggested strong segregation of the Cu-In-S elements in the spray-pyrolysis-deposited layer. The degree of segregation depended on the substrate ( , , or ), although Cu3In5S9 nanoparticles were segregated in the sulfur layer.