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Proceedings Paper

Volume holographic lens spectrum-splitting photovoltaic system for high energy yield with direct and diffuse solar illumination
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Paper Abstract

In this paper a prototype spectrum-splitting photovoltaic system based on volume holographic lenses (VHL) is designed, fabricated and tested. In spectrum-splitting systems, incident sunlight is divided in spectral bands for optimal conversion by a set of single-junction PV cells that are laterally separated. The VHL spectrumsplitting system in this paper has a form factor similar to conventional silicon PV modules but with higher efficiencies (>30%). Unlike many other spectrum-splitting systems that have been proposed in the past, the system in this work converts both direct and diffuse sunlight while using inexpensive 1-axis tracking systems. The VHL system uses holographic lenses that focus light at a transition wavelength to the boundary between two PV cells. Longer wavelength light is dispersed to the narrow bandgap cell and shorter wavelength light to the wide bandgap cell. A prototype system is designed with silicon and GaAs PV cells. The holographic lenses are fabricated in Covestro Bayfol HX photopolymer by ‘stitching’ together lens segments through sequential masked exposures. The PV cells and holographic lenses were characterized and the data was used in a raytrace simulation and predicts an improvement in total power output of 15.2% compared to a non-spectrum-splitting reference. A laboratory measurement yielded an improvement in power output of 8.5%.

Paper Details

Date Published: 25 August 2017
PDF: 10 pages
Proc. SPIE 10368, Next Generation Technologies for Solar Energy Conversion VIII, 103680G (25 August 2017); doi: 10.1117/12.2273204
Show Author Affiliations
Benjamin D. Chrysler, The Univ. of Arizona (United States)
College of Optical Sciences, The Univ. of Arizona (United States)
Yuechen Wu, The Univ. of Arizona (United States)
Zhengshan Yu, Arizona State Univ. (United States)
Raymond K. Kostuk, The Univ. of Arizona (United States)
College of Optical Sciences, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 10368:
Next Generation Technologies for Solar Energy Conversion VIII
Oleg V. Sulima; Gavin Conibeer, Editor(s)

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