Journal
IEEE JOURNAL OF PHOTOVOLTAICS
Volume 5, Issue 1, Pages 418-424Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2014.2361014
Keywords
Luminescent coupling; multijunction photovoltaic cells; radiative efficiency; III-V
Funding
- U.S. Department of Energy [DE-AC36-08-GO28308]
- National Renewable Energy Laboratory
- People Programme (Marie Curie Actions) of the European Union [299878]
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Nonradiative recombination in inverted GaInP junctions is dramatically reduced using a rear-heterojunction design rather than the more traditional thin-emitter homojunction design. When this GaInP junction design is included in inverted multijunction solar cells, the high radiative efficiency translates into both higher subcell voltage and high luminescence coupling to underlying subcells, both of which contribute to improved performance. Subcell voltages within two and four junction devices are measured by electroluminescence and the internal radiative efficiency is quantified as a function of recombination current using optical modeling. The performance of these concentrator multijunction devices is compared with the Shockley-Queisser detailed-balance radiative limit, as well as an internal radiative limit, which considers the effects of the actual optical environment in which a perfect junction may exist.
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