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Photovoltaic Performance of Flexible Cu(In,Ga)Se2 Thin-Film Solar Cells with Varying Cr Impurity Barrier Thickness
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- Authors
- Dae-Hyung Cho, Yong-Duck Chung, Kyu-Seok Lee, Kyung-Hyun Kim, Ju-Hee Kim, Soo-Jeong Park, Jeha Kim
- Issue Date
- 2013-11
- Citation
- Current Applied Physics, v.13, no.9, pp.2033-2037
- ISSN
- 1567-1739
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- We report the effect of Cr impurity barrier on Cu(In,Ga)Se2 (CIGS) thin-film solar cells prepared on flexible substrates. The Cr films with varying the thickness (tCr) were deposited on stainless steel substrates using direct-current magnetron sputtering. The solar cell performance was improved by increasing tCr since the diffusion of Fe impurities from the substrate to CIGS was suppressed. Although the elemental composition, grain size, and strain of CIGS film showed little change with varying Fe content, the fill factor and the short-circuit current density increased as decreasing Fe. The Fe increased the series resistance, shunt paths, and saturation current density. The reduction of Fe caused a steeper bandgap grading in CIGS which enhances current collection due to higher electric fields in bulk CIGS. CIGS solar cells with 1000 nm-thick Cr barrier showed the best conversion efficiency of 9.05%. © 2013 Elsevier B.V. All rights reserved.
- KSP Keywords
- Barrier thickness, CIGS film, CIGS solar cell, Conversion efficiency(C.E.), Cr films, Current collection, Direct current(DC), Direct-current magnetron sputtering, Effect of Cr, Electric Field, Elemental composition