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학술지 Photovoltaic Performance of Flexible Cu(In,Ga)Se2 Thin-Film Solar Cells with Varying Cr Impurity Barrier Thickness
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저자
조대형, 정용덕, 이규석, 김경현, 김주희, 박수정, 김제하
발행일
201311
출처
Current Applied Physics, v.13 no.9, pp.2033-2037
ISSN
1567-1739
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.cap.2013.09.005
협약과제
12VB3400, CIGS 박막 태양전지 구조상의 Cd-free 버퍼층에 손상을 주지 않는 TCO 증착 기술 개발, 정용덕
초록
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.
키워드
Barrier thickness, CIGS solar cell, Cr impurity barrier, Photovoltaic performance
KSP 제안 키워드
Bandgap grading, 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, Fe content