High-efficiency Köhler photovoltaic concentrators with external light confinement

Zamora Herranz, Pablo and Benitez Gimenez, Pablo and Miñano Dominguez, Juan Carlos and Li, Yang and Buljan, Marina (2011). High-efficiency Köhler photovoltaic concentrators with external light confinement. In: "Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII", 21/08/2011 - 22/08/2011, San Diego, EEUU. pp. 1-8.

Description

Title: High-efficiency Köhler photovoltaic concentrators with external light confinement
Author/s:
  • Zamora Herranz, Pablo
  • Benitez Gimenez, Pablo
  • Miñano Dominguez, Juan Carlos
  • Li, Yang
  • Buljan, Marina
Item Type: Presentation at Congress or Conference (Article)
Event Title: Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII
Event Dates: 21/08/2011 - 22/08/2011
Event Location: San Diego, EEUU
Title of Book: Proceedings of Nonimaging Optics: Efficient Design for Illumination and Solar Concentration VIII
Date: 2011
Volume: 8124
Subjects:
Faculty: Centro de Domótica Integral (CeDInt) (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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%.

More information

Item ID: 12901
DC Identifier: http://oa.upm.es/12901/
OAI Identifier: oai:oa.upm.es:12901
Deposited by: Memoria Investigacion
Deposited on: 08 Nov 2012 11:31
Last Modified: 21 Apr 2016 12:13
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