Nano-patterned glass superstrates with different aspect ratios for enhanced light harvesting in a-Si:H thin film solar cells

Nano-patterned glass superstrates obtained via a large-area production approach are desirable for antireflection and light trapping in thin-film solar cells. The tapered nanostructures allow a graded refractive index profile between the glass and material interfaces, leading to suppressed surface re...

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Published inOptics express Vol. 20; no. 10; pp. A412 - A417
Main Authors Chen, Ting-Gang, Yu, Peichen, Tsai, Yu-Lin, Shen, Chang-Hong, Shieh, Jia-Min, Tsai, Min-An, Kuo, Hao-Chung
Format Journal Article
LanguageEnglish
Published United States 07.05.2012
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Summary:Nano-patterned glass superstrates obtained via a large-area production approach are desirable for antireflection and light trapping in thin-film solar cells. The tapered nanostructures allow a graded refractive index profile between the glass and material interfaces, leading to suppressed surface reflection and increased forward diffraction of light. In this work, we investigate nanostructured glass patterns with different aspect ratios using scalable nanosphere lithography for hydrogenated amorphous silicon (a-Si:H) thin film solar cells. Compared to flat glass cell and Asahi U-type glass cell, enhancements in short-circuit current density (J(sc)) of 51.6% and 8%, respectively, were achieved for a moderate aspect ratio of 0.16. The measured external quantum efficiencies (EQE) spectra confirmed a broadband enhancement due to antireflection and light trapping properties.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.20.00A412