| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| The Relationship Between the Design of the DBR Structure and the Performance of GaInP/GaInAs/Ge Solar Cell |
| GAO Hui1,2, YANG Ruixia1,*
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1 School of Electronic Information Engineering ,Hebei University of Technology , Tianjin 300401, China
2 The 18th Research Institute of China Electronics Technology Group Corporation, Tianjin 300384, China |
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Abstract The space solar cell adopts the distributed Bragg reflection (DBR) structure as the back reflector of the GaInAs subcell, which can reduce the thickness of the base region, thereby improving the radiation resistance of the whole structure. The optical reflection characteristics of DBR have a great influence on various performances of the subcells. In this study, three Al0.9Ga0.1As/Al0.1Ga0.9As DBR structures with different reflection characteristics were prepared and applied to the same GaInP/GaInAs/Ge lattice-matched solar cell as the back reflector of a GaInAs subcell. The research analyzes its influence on the optical reflectivity, photovoltaic performance and radiation attenuation performance of the tandem solar cells. The results show that,for solar cells with a material band gap of 1.87 eV/1.40 eV/0.67 eV, as the center reflection wavelength of the DBR is fine-tuned from 865 nm to 875 nm, and then 885 nm, the optical reflectance, photovoltaic performance and the radiation attenuation performance show regular changes. The reflectivity of the cells showed a regular red shift, and the initial photovoltaic efficiency performance changed from low to high. After the geosynchronous orbital dose electron bombardment experiment, the final radiation decay rate of the cells changed from low to high. At the same time, properly adjusting the reflection range of the DBR to the long-wave direction can obtain a higher initial efficiency, and the efficiency at the end of life has not significantly deteriorated, which has great significance for the application throughout the life cycle of a space project.
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Published: 25 February 2022
Online: 2022-02-28
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2022, Vol. 36 
