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Enhanced conversion efficiency in nanocrystalline solar cells using optically functional patterns

Authors
Kim, Yang DooPark, Sang JunJang, EunseokOh, Kyoung SukCho, Jun-SikLee, Heon
Issue Date
31-7월-2015
Publisher
ELSEVIER SCIENCE SA
Keywords
Nanocrystalline silicon; Pattern; Optical function; Direct printing technique
Citation
THIN SOLID FILMS, v.587, pp.52 - 56
Indexed
SCIE
SCOPUS
Journal Title
THIN SOLID FILMS
Volume
587
Start Page
52
End Page
56
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/92975
DOI
10.1016/j.tsf.2015.02.026
ISSN
0040-6090
Abstract
The lower conversion efficiency of nanocrystalline silicon (nc-Si:H) solar cells is a result of its lower photon absorption capability of nc-Si:H. To increase photon absorption of nc-Si:H, the Ag substrates were fabricated with optically functional patterns. Two types of patterns, with random and regular structures, were formed by direct imprint technology. Owing to these optically functional patterns, the scattering of reflected light at the surface of the patterned Ag was enhanced and the optical path became longer. Thus, a greater amount of photons was absorbed by the nc-Si: H layer. Compared to flat Ag (without a surface pattern), the light absorption value of the nc-Si:H layer with a random structure pattern was increased at wavelengths ranging from 600 to 1100 nm. In the case of the regular patterned Ag, the light absorption value of the nc-Si:H layer was higher than the flat Ag at 300 to 1100 nm. Subsequently, nc-Si:H solar cells constructed on the optically functional pattern exhibit a 15.7% higher J(sc) value and a 19.5% higher overall conversion efficiency, compared to an identical solar cell on flat Ag. (C) 2015 Elsevier B.V. All rights reserved.
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공과대학 (신소재공학부)
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