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High Concentration Photovoltaics (HCPV) with Diffractive Secondary Optical Elements

1
Advanced Research & Development, Maxim Integrated, San Jose, CA 95134, USA
2
Department of Electrical and Electronics Engineering, Batman University, Batman 72060, Turkey
*
Author to whom correspondence should be addressed.
Photonics 2019, 6(2), 68; https://doi.org/10.3390/photonics6020068
Received: 5 May 2019 / Revised: 29 May 2019 / Accepted: 11 June 2019 / Published: 12 June 2019
(This article belongs to the Special Issue Nonimaging Optics in Solar Energy)
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Abstract

Multi-junction solar cells can be economically viable for terrestrial applications when operated under concentrated illuminations. The optimal design of concentrator optics in high concentration photovoltaics (HCPV) systems is crucial for achieving high energy conversion. At a high geometric concentration, chromatic aberration of the primary lens can restrict the optical efficiency and acceptance angle. In order to correct chromatic aberration, multi-material, multi-element refractive elements, hybrid refractive/diffractive elements, or multi-element refractive and diffractive systems can be designed. In this paper, the effect of introducing a diffractive surface in the optical path is analyzed. An example two-stage refractive and diffractive optical system is shown to have an optical efficiency of up to 0.87, and an acceptance angle of up to ±0.55° with a 1600× geometric concentration ratio, which is a significant improvement compared to a single-stage concentrator system with a single material. This optical design can be mass-produced with conventional fabrication methods, thus providing a low-cost alternative to other approaches, and the design approach can be generalized to many other solar concentrator systems with different cell sizes and geometric concentration ratios. View Full-Text
Keywords: high concentration photovoltaics; diffractive optics; optical system design; solar energy; Fresnel lens; secondary optical element high concentration photovoltaics; diffractive optics; optical system design; solar energy; Fresnel lens; secondary optical element
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Sahin, F.E.; Yılmaz, M. High Concentration Photovoltaics (HCPV) with Diffractive Secondary Optical Elements. Photonics 2019, 6, 68.

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