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Proceedings Paper

High-efficiency Köhler photovoltaic concentrators with external light confinement
Author(s): Pablo Zamora; Pablo Benítez; Juan C. Miñano; Yang Li; Marina Buljan
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Paper Abstract

Metal grid lines are a vital element in multijunction solar cells in order to take out from the cell the generated photocurrent. Nevertheless all this implies certain shadowing factor and thus certain reflectivity on cells surface that lowers its light absorption. This reflectivity produces a loss in electrical efficiency and thus a loss in global energy production for CPV systems. We present here an optical design for recovering this portion of reflected light, and thus leading to a system efficiency increase. This new design is based on an external confinement cavity, an optical element able to redirect the light reflected by the cell towards its surface again. It has been possible thanks to the recent invention of the advanced Köhler concentrators by LPI, likely to integrate one of these cavities easily. We have proven the excellent performance of these cavities integrated in this kind of CPV modules offering outstanding results: 33.2% module electrical efficiency @Tcell=25ºC and relative efficiency and Isc gains of over 6%.

Paper Details

Date Published: 22 September 2011
PDF: 8 pages
Proc. SPIE 8124, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII, 81240J (22 September 2011); doi: 10.1117/12.894414
Show Author Affiliations
Pablo Zamora, Univ. Politécnica de Madrid (Spain)
Pablo Benítez, Univ. Politécnica de Madrid (Spain)
Light Prescriptions Innovators, LLC (United States)
Juan C. Miñano, Univ. Politécnica de Madrid (Spain)
Light Prescriptions Innovators, LLC (United States)
Yang Li, Zhejiang Univ. (China)
Marina Buljan, 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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