Free-form Fresnel RXI-RR Köhler design for high-concentration photovoltaics with spectrum-splitting

M. Buljan; P. Benítez; R. Mohedano; J. C. Miñano; Y. Sun; W. Falicoff; J. Vilaplana; J. Chaves; G. Biot; J. López

doi:10.1117/12.894404

22 September 2011 Free-form Fresnel RXI-RR Köhler design for high-concentration photovoltaics with spectrum-splitting

M. Buljan, P. Benítez, R. Mohedano, J. C. Miñano, Y. Sun, W. Falicoff, J. Vilaplana, J. Chaves, G. Biot, J. López

Proceedings Volume 8124, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII; 81240H (2011) https://doi.org/10.1117/12.894404
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

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%.

Citation Download Citation

M. Buljan, P. Benítez, R. Mohedano, J. C. Miñano, Y. Sun, W. Falicoff, J. Vilaplana, J. Chaves, G. Biot, and J. López "Free-form Fresnel RXI-RR Köhler design for high-concentration photovoltaics with spectrum-splitting", Proc. SPIE 8124, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII, 81240H (22 September 2011); https://doi.org/10.1117/12.894404

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