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Si Microwire Solar Cells: Improved Efficiency with a Conformal SiO2 Layer

Author(s)
Seo, KwanyongYu, Young J.Duane, PeterZhu, WenqiPark, HyunsungWober, MunibCrozier, Kenneth B.
Issued Date
2013-06
DOI
10.1021/nn401776x
URI
https://scholarworks.unist.ac.kr/handle/201301/6968
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84879678426
Citation
ACS NANO, v.7, no.6, pp.5539 - 5545
Abstract
Silicon microwire arrays have attracted considerable attention recently due to the opportunity they present as highly efficient and cost-effective solar cells. In this study, we report on efficient Si microwire array solar cells with areas of 1 cm2 and Air Mass 1.5 Global conversion efficiencies of up to 10.6%. These solar cells show an open-circuit voltage of 0.56 V, a short-circuit current density of 25.2 mA/cm2, and a fill factor of 75.2%, with a silicon absorption region that is only 25 μm thick. In particular, the maximum overall efficiency of the champion device is improved from 8.71% to 10.6% by conformally coating the wires with a 200 nm thick SiO2 layer. Optical measurements reveal that the layer reduces reflection significantly over the entire visible range.
Publisher
AMER CHEMICAL SOC
ISSN
1936-0851
Keyword (Author)
siliconmicrowiresolar cellsradial junctionantireflectionlight trapping
Keyword
SILICON NANOWIREPHOTOVOLTAIC APPLICATIONSOPTICAL-ABSORPTIONNANOCONE ARRAYSSURFACE DAMAGEMULTICRYSTALLINEPRINCIPLESDESIGN

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