CuIn,GaSe2 Thin Films Codoped with Sodium and Bismuth Ions for the Use in the Solar CellsReport as inadecuate

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Journal of Nanomaterials - Volume 2015 2015, Article ID 579510, 7 pages -

Research ArticleDepartment of Chemical Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan

Received 8 October 2014; Revised 31 March 2015; Accepted 9 April 2015

Academic Editor: Edward A. Payzant

Copyright © 2015 Fu-Shan Chen 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.


The codoping effects of sodium and bismuth ions on the characteristics of CuIn,GaSe2 films prepared via the solution process were investigated in this study. When sodium and bismuth ions were incorporated into CuIn,GaSe2, the ratio of the intensity of 112 diffraction peak to that of 220-204 diffraction peak was greatly increased. The codoping process not only enlarged the sizes of the grains in the films but also resulted in densification of the films. The carrier concentration of CuIn,GaSe2 was found to be effectively increased to cause a reduction in the resistivity of the films. The above phenomena were attributed to the densified microstructures of the films and a decrease in the amount of the donor-type defects. The leakage current of the solar cells was found to be also decreased via the codoping process. Owing to the improved electrical properties of CuIn,GaSe2 films, the conversion efficiency of the fabricated solar cells was significantly enhanced.

Author: Fu-Shan Chen, Jen-Cheng Sung, Che-Yuan Yang, and Chung-Hsin Lu



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