Materials and Device Modeling and Simulation

Periodic microstructures for improved lens-to-waveguide coupling efficiency in microlens array planar solar concentrators

[+] Author Affiliations
Ravi S. Hegde, Hong Son Chu, Ching Eng Png

A*STAR Institute of High Performance Computing, Department of Electronics and Photonics, 1 Fusionopolis Way, #16–16, Connexis North, Singapore 138632, Singapore

Kiansoo Ong, Lakshmi Kanta Bera

A*STAR Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore

J. Photon. Energy. 5(1), 052099 (Jun 12, 2015). doi:10.1117/1.JPE.5.052099
History: Received March 23, 2015; Accepted May 15, 2015
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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).

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Ravi S. Hegde ; Hong Son Chu ; Kiansoo Ong ; Lakshmi Kanta Bera and Ching Eng Png
"Periodic microstructures for improved lens-to-waveguide coupling efficiency in microlens array planar solar concentrators", J. Photon. Energy. 5(1), 052099 (Jun 12, 2015). ; http://dx.doi.org/10.1117/1.JPE.5.052099


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