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Journal of Photonics for Energy

Periodic microstructures for improved lens-to-waveguide coupling efficiency in microlens array planar solar concentrators
Author(s): Ravi S. Hegde; Hong-Son Chu; Kiansoo Ong; Lakshmi Kanta Bera; Ching Eng Png
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Paper Abstract

Thin form-factor planar sunlight concentrators fabricated using low-cost materials in conjunction with high-efficiency solar cells may prove economically competitive with silicon photovoltaics. A periodic structure with planar interfaces employing an array of microlenses and coupling structures is amenable to high-volume imprint manufacturing and hence a drastic cost reduction. A numerical study of periodic prismatic void structures aligned with microlenses to efficiently couple incoming light into a constant cross-section channel waveguide is reported. Three different prism-like cut-out structures: a bare prism, a planar connected prism, and a pointed prism are proposed. Numerical results show that the proposed pointed prism design offers a high-efficiency coupling with one-sided output (90.8% and 85.4% peak efficiency at concentration ratios of 320× and 400×, respectively).

Paper Details

Date Published: 12 June 2015
PDF: 10 pages
J. Photon. Energy. 5(1) 052099 doi: 10.1117/1.JPE.5.052099
Published in: Journal of Photonics for Energy Volume 5, Issue 1
Show Author Affiliations
Ravi S. Hegde, A*STAR Institute of High Performance Computing (Singapore)
Hong-Son Chu, A*STAR Institute of High Performance Computing (Singapore)
Kiansoo Ong, A*STAR Institute of Materials Research and Engineering (Singapore)
Lakshmi Kanta Bera, A*STAR Institute of Materials Research and Engineering (Singapore)
Ching Eng Png, A*STAR Institute of High Performance Computing (Singapore)


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