Enhancing photovoltaic output power by 3-band spectrum-splitting and concentration using a diffractive micro-optic
- Univ. of Utah, Salt Lake City, UT (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
We report the enhancement of photovoltaic output power by separating the incident spectrum into 3 bands, and concentrating these bands onto 3 different photovoltaic cells. The spectrum-splitting and concentration is achieved via a thin, planar micro-optical element that demonstrates high optical efficiency over the entire spectrum of interest. The optic (which we call a polychromat) was designed using a modified version of the direct-binary-search algorithm. The polychromat was fabricated using grayscale lithography. Rigorous optical characterization demonstrates excellent agreement with simulation results. Electrical characterization of the solar cells made from GaInP, GaAs and Si indicate increase in the peak output power density of 43.63%, 30.84% and 30.86%, respectively when compared to normal operation without the polychromat. This represents an overall increase of 35.52% in output power density. As a result, the potential for cost-effective large-area manufacturing and for high system efficiencies makes our approach a strong candidate for low cost solar power.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1242472
- Report Number(s):
- NREL/JA-5J00-63316; OPEXFF
- Journal Information:
- Optics Express, Vol. 22, Issue S6; Related Information: Optics Express; ISSN 1094-4087
- Publisher:
- Optical Society of America (OSA)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Broadband imaging with one planar diffractive lens
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journal | February 2018 |
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