期刊
THIN SOLID FILMS
卷 535, 期 -, 页码 326-330出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2012.09.022
关键词
Copper indium gallium selenide (CIGS); Photoelectric properties; Reverse breakdown; Defects
Partial shading of solar modules can subject shaded cells to significant reverse bias, often large enough to force them into electrical breakdown, possibly resulting in irreversible damage. Therefore, better understanding of reverse current-voltage characteristics might lead to improvements in the design of solar modules. The focus of this study is the breakdown behavior of Cu(In, Ga)Se-2 (CIGS) cells in darkness and under illumination. Two series of CIGS cells were investigated, with CdS and Zn-Sn-O buffer layers of varying thickness. Electrical breakdown was found to be highly dependent on the buffer layer. Under blue illumination a remarkable decrease in breakdown voltage was observed for both buffer types. Metastable defects in the buffer/CIGS interface region are tentatively proposed as the source of this effect and tunnelling is suggested as the main mechanism responsible for breakdowns. (C) 2012 Elsevier B.V. All rights reserved.
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