Evaluation of subcell power conversion efficiencies of radiation-damaged triple-junction solar cells using photoluminescence decays
| Autor: | Yoshihiko Kanemitsu, David M. Tex, Takeshi Ohshima, Tetsuya Nakamura, Mitsuru Imaizumi, Toshiyuki Ihara |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Photoluminescence Maximum power principle Proton Renewable Energy Sustainability and the Environment business.industry Energy conversion efficiency 02 engineering and technology Radiation 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials 0103 physical sciences Radiation damage Optoelectronics Quantum efficiency Irradiation Electrical and Electronic Engineering 0210 nano-technology business |
| Zdroj: | Progress in Photovoltaics: Research and Applications. 25:1005-1014 |
| ISSN: | 1062-7995 |
| DOI: | 10.1002/pip.2912 |
| Popis: | We characterize the radiation-induced damage of InGaP/GaAs/Ge solar cells for various proton irradiation energies and fluences using conventional current-voltage (I-V) measurements, external quantum efficiency, and a noncontact time-resolved photoluminescence (PL) technique. From the I-V curves, we obtain the conversion efficiency of the entire device. The external quantum efficiency showed that the short-circuit current is only determined by the top InGaP subcell. To obtain accurate information about the point of maximum power, a new PL technique is introduced. The PL time decays of the InGaP and GaAs subcells are measured to obtain the characteristic decay time constants of carrier separation and recombination. We empirically verify that the time-resolved PL method can be used to predict the electrical conversion efficiency of the subcells. We find that the limiting subcell at the point of maximum power is different from that for short-circuit current. Radiation damage in unexpected regions of the device is revealed using this optical method. |
| Databáze: | OpenAIRE |
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