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Proceedings Paper

Thin solar concentrator with high concentration ratio
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Paper Abstract

Solar concentrators are often used in conjunction with III-V multi-junction solar cells for cost reduction and efficiency improvement purposes. High flux concentration ratio, high optical efficiency and high manufacture tolerance are the key features required for a successful solar concentrator design. This paper describes a novel solar concentrator that combines the concepts, and thus the advantages, of both the refractive type ad reflective type. The proposed concentrator design adopts the Etendue-cascading concept that allows the light beams from all the concentric annular entrance pupils to be collected and transferred to the solar cell with minimal loss. This concept enables the system to perform near its Etendue-Limit and have a high concentration ratio simultaneously. Thereby reducing the costs of solar cells and therefor achieves a better the per watts cost. The concentrator demonstrated has a thing aspect ratio of 0.19 with a zero back focal distance. The numerical aperture at the solar cell immersed inside the dielectric concentrator is as high as 1.33 achieving a unprecedented high optical concentration ratio design.

Paper Details

Date Published: 9 September 2013
PDF: 5 pages
Proc. SPIE 8821, High and Low Concentrator Systems for Solar Electric Applications VIII, 88210H (9 September 2013); doi: 10.1117/12.2023536
Show Author Affiliations
Jhe-Syuan Lin, National Central Univ. (Taiwan)
Chao-Wen Liang, National Central Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8821:
High and Low Concentrator Systems for Solar Electric Applications VIII
Adam P. Plesniak, Editor(s)

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