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Optical conductivity of highly mismatched GaP alloys
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/content/aip/journal/apl/102/2/10.1063/1.4773526
2013-01-14
2014-07-24

Abstract

Highly mismatched alloys are promising for applications to intermediate-band (IB) solar cells. Here, we report first-principles prediction of intermediate bands in GaP on the basis of hybrid-density-functional theory, which enables to handle large supercells including defects with much better accuracy than semilocal functionals. Calculated optical conductivity reveals that the intermediate states due to co-doped Mg and O have sufficiently high optical transition probability. The multiple gaps are robust against thermalization. Intermediate-band states become more delocalized by hybridization with phosphorus-vacancy states, increasing the optical transition probability.

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Scitation: Optical conductivity of highly mismatched GaP alloys
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/2/10.1063/1.4773526
10.1063/1.4773526
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