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Proceedings Paper

Free-form Fresnel RXI-RR Köhler design for high-concentration photovoltaics with spectrum-splitting
Author(s): M. Buljan; P. Benítez; R. Mohedano; J. C. Miñano; Y. Sun; W. Falicoff; J. Vilaplana; J. Chaves; G. Biot; J. López
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Paper Abstract

Development of a novel HCPV nonimaging concentrator with high concentration (>500x) and built-in spectrum splitting concept is presented. It uses the combination of a commercial concentration GaInP/GaInAs/Ge 3J cell and a concentration Back-Point-Contact (BPC) silicon cell for efficient spectral utilization, and external confinement techniques for recovering the 3J cell's reflection. The primary optical element (POE) is a flat Fresnel lens and the secondary optical element (SOE) is a free-form RXI-type concentrator with a band-pass filter embedded in it - Both the POE and SOE performing Köhler integration to produce light homogenization on the receiver. The band-pass filter transmits the IR photons in the 900-1200 nm band to the silicon cell. A design target of an "equivalent" cell efficiency ~46% is predicted using commercial 39% 3J and 26% Si cells. A projected CPV module efficiency of greater than 38% is achievable at a concentration level larger than 500X with a wide acceptance angle of ±1°. A first proof-of concept receiver prototype has been manufactured using a simpler optical architecture (with a lower concentration, ~100x and lower simulated added efficiency), and experimental measurements have shown up to 39.8% 4J receiver efficiency using a 3J cell with a peak efficiency of 36.9%.

Paper Details

Date Published: 22 September 2011
PDF: 11 pages
Proc. SPIE 8124, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII, 81240H (22 September 2011); doi: 10.1117/12.894404
Show Author Affiliations
M. Buljan, Univ. Politécnica de Madrid (Spain)
P. Benítez, Univ. Politécnica de Madrid (Spain)
Light Prescriptions Innovators, LLC (United States)
R. Mohedano, Light Prescriptions Innovators Europe, S. L. (Spain)
J. C. Miñano, Univ. Politécnica de Madrid (Spain)
Light Prescriptions Innovators, LLC (United States)
Y. Sun, Light Prescriptions Innovators, LLC (United States)
W. Falicoff, Light Prescriptions Innovators, LLC (United States)
J. Vilaplana, Light Prescriptions Innovators Europe, S. L. (Spain)
J. Chaves, Light Prescriptions Innovators Europe, S. L. (Spain)
G. Biot, Univ. Politécnica de Madrid (Spain)
J. López, Univ. Politécnica de Madrid (Spain)


Published in SPIE Proceedings Vol. 8124:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII
Roland Winston; Jeffrey M. Gordon, Editor(s)

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