Asymmetric back contact nanograting design for thin c-Si solar cells

Title
Asymmetric back contact nanograting design for thin c-Si solar cells
Authors
김인호정두석이욱성김원목이경석이택성
Keywords
crystalline silicon solar cells; light trapping; nanograting; diffraction; asymmetric grating
Issue Date
2016-05
Publisher
Current applied physics
Citation
VOL 16, 568-573
Abstract
Texturing of silicon wafers with periodic gratings in submicron scale is one of effective light trapping routes especially for thin crystalline silicon solar cells. The grating can be very effective for trapping of photons near band gap of crystalline silicon when its period is suitably chosen. The asymmetric gratings provide higher light trapping efficiency than symmetric ones because the asymmetric one suppress the escape of internally reflected light in the silicon wafers. In this study, we conceptually show that asymmetric grating can be fabricated by simple stacking of a dielectric layer onto the symmetric silicon grating structures. Optical simulations were performed to calculate optical absorptions in thin crystalline silicon of a 5 μm thickness with symmetric and asymmetric grating structures. We demonstrate that with the asymmetric grating structures combined with highly efficient antireflection coating, optical absorptions in the thin silicon wafers can reach over 97% of the Lambertian absorption limit.
URI
http://pubs.kist.re.kr/handle/201004/58675
ISSN
15671739
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KIST Publication > Article
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