Silicon nanodisk array design for effective light trapping in ultrathin c-Si

Title
Silicon nanodisk array design for effective light trapping in ultrathin c-Si
Authors
김인호정두석이욱성김원목이택성이도권송종한김준곤이경석
Keywords
Ultrathin c-Si wafer; Light trapping; Solar cells; Mie scattering; Nanodisk arrays
Issue Date
2014-10
Publisher
Optics express
Citation
VOL 22, NO S6, A1431-A1439
Abstract
The use of ultrathin c-Si (crystalline silicon) wafers thinner than 20 μm for solar cells is a very promising approach to realize dramatic reduction in cell cost. However, the ultrathin c-Si requires highly effective light trapping to compensate optical absorption reduction. Conventional texturing in micron scale is hardly applicable to the ultrathin c-Si wafers; thus, nano scale texturing is demanded. In general, nanotexturing is inevitably accompanied by surface area enlargements, which must be minimized in order to suppress surface recombination of minority carriers. In this study, we demonstrate using optical simulations that periodic c-Si nanodisk arrays of short heights less than 200 nm and optimal periods are very useful in terms of light trapping in the ultrathin c-Si wafers while low surface area enlargements are maintained. Double side texturing with the nanodisk arrays leads to over 90% of the Lambertian absorption limit while the surface area enlargement is kept below 1.5.
URI
https://pubs.kist.re.kr/handle/201004/48088
ISSN
10944087
Appears in Collections:
KIST Publication > Article
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