Evaluation of subcell power conversion efficiencies of radiation-damaged triple-junction solar cells using photoluminescence decays

David M. Tex, Toshiyuki Ihara, Tetsuya Nakamura, Mitsuru Imaizumi, Takeshi Ohshima, Yoshihiko Kanemitsu

Index: 10.1002/pip.2912

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Abstract

The subcell conversion efficiencies of proton damaged samples are determined with a new optical method that does not require any electrical contacts. By measuring the excitation power dependence of time-resolved photoluminescence decays, three unique time constants are obtained. We discuss the physical meanings of the time constants, show how they can be used to determine the subcell conversion efficiencies, and compare the results with electrical measurements.