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Silicon concentrator cells in an one-axis tracking concentrator system with a concentration ratio of 300/spl times/

: Mohr, A.; Roth, T.; Epmeier, M.; Glunz, S.W.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Electron Devices Society:
Thirty-First IEEE Photovoltaic Specialists Conference 2005. Conference record : Coronado Springs Resort, Lake Buena Vista, FL, January 3 - 7, 2005
Piscataway, NJ: IEEE, 2005
ISBN: 0-7803-8707-4
Photovoltaic Specialists Conference (PVSC) <31, 2005, Lake Buena Vista/Fla.>
Conference Paper
Fraunhofer ISE ()

A solar concentrator system with one-axis tracking was developed at Fraunhofer ISE enabling a high geometrical concentration of 300x. This system uses a parabolic trough mirror and a three-dimensional second stage consisting of compound parabolic concentrators (CPCs). These CPCs are optimised for concentrating the sunlight by total internal reflection up to a geometrical concentration ratio of 7.7x. For this linear concentrator system and particularly for an easy cell integration, we have developed a rear-line-contacted silicon concentrator cell (RLCC) achieving a maximum efficiency of 25% at around 100 suns. The silicon concentrator cell has a small-sized active area of 0.2025 cm2 matching with the exit area of the CPCs. The concentrator system consisting of mirror, CPCs and RLCC cells reaches an efficiency of over 16% under real outdoor conditions. In this paper outdoor measurement results of a cell string integrated in the concentrator system are presented, the perfo rmance losses are discussed in detail and a realistic estimation of the maximum efficiency of the concentrator system is given.