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The optical and structural properties of CuIn1-x Ga (x) Se-2 thin films fabricated with various Ga contents by using the co-evaporation technique

Title
The optical and structural properties of CuIn1-x Ga (x) Se-2 thin films fabricated with various Ga contents by using the co-evaporation technique
Authors
Jo, Hyun-JunKim, Dae-HwanKim, ChanHwang, Dae-KueSung, Shi-JoonKim, Jeong-HwaBae, In-Ho
DGIST Authors
Kim, Dae-HwanHwang, Dae-Kue; Sung, Shi-Joon
Issue Date
2012-05
Citation
Journal of the Korean Physical Society, 60(10), 1708-1712
Type
Article
Article Type
Article
Keywords
CIGSDefectGa/[In+Ga] Ratio
ISSN
0374-4884
Abstract
The purpose of the present study is to investigate the optical and the structural properties of CuIn 1-xGa xSe 2 (CIGS) thin films with various Ga/[In+Ga] ratios grown by using the coevaporation technique. The Ga ratios were 0, 0.15, 0.29, 0.40, 0.56, 0.73, and 1. As the Ga/[In+Ga] ratio increased, the grain size of CIGS films decreased, and the X-ray diffraction (XRD) peaks of the CIGS films progressively shifted to higher diffraction angles. In the cross-sectional scanning electron microscopy (SEM) images, the grain size of the CIGS thin films near the molybdenum electrode was smaller than it was near the CIGS surface. These results indicate that the diffusion rates of elements were different. The photocurrent (PC) spectra also showed that the band gap energy of the CIGS films increased as the Ga/[In+Ga] ratio increased. Accordingly, the short-circuit current density (J SC) linearly decreased, and the open-circuit voltage (V OC) increased and saturated at high Ga/[In+Ga] ratios (x > 0.4) due to the defects on the CIGS films surface. A correlation between the Ga/[In+Ga] ratio and the number of surface defects for the CIGS films is discussed. © 2012 The Korean Physical Society.
URI
http://hdl.handle.net/20.500.11750/5362
DOI
10.3938/jkps.60.1708
Publisher
Korean Physical Society
Related Researcher
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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