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  4. Current-matched triple-junction solar cell reaching 41.1% conversion efficiency under concentrated sunlight
 
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2009
Journal Article
Title

Current-matched triple-junction solar cell reaching 41.1% conversion efficiency under concentrated sunlight

Abstract
A metamorphic Ga0.35In0.65P/Ga0.83In0.17As/Ge triple-junction solar cell is shown to provide current-matching of all three subcells and thus composes a device structure with virtually ideal band gap combination. We demonstrate that the key for the realization of this device is the improvement of material quality of the lattice-mismatched layers as well as the development of a highly relaxed Ga1-yInyAs buffer structure between the Ge substrate and the middle cell. This allows the metamorphic growth with low dislocation densities below 10(6) cm(-2). The performance of the approach has been demonstrated by a conversion efficiency of 41.1% at 454 suns (454 kW/m(2), AM1.5d ASTM G173-03).
Author(s)
Guter, Wolfgang
Schöne, J.
Philipps, Simon P.  
Steiner, Marc  
Siefer, Gerald  
Wekkeli, Alexander  
Welser, E.
Oliva, Eduard  
Bett, Andreas W.  
Dimroth, Frank  
Journal
Applied Physics Letters  
DOI
10.1063/1.3148341
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • III-V-Solarzellen

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