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Proceedings Paper

Influence of the base layer thickness and the graded buffer layer thickness on the conversion efficiency of a metamorphic triple-junction solar cell
Author(s): Minghui Song; Hu Wang; Yankai Xiong; Yuqin Sun; Chenhui Yu; Zhihao Wu; Changqing Chen
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Paper Abstract

Metamorphic multiple-junction soalr cells based on III-V compound semiconductor have advantages of more degree of freedom in selection of bandgaps of subcells. Recently, Spectrolab, Inc. reported a high conversion efficiency of 40.7% in a triple-junction Ga0.44In0.56P/Ga0.92In0.08As/Ge solar cell where the top and middle cells are lattice-mismatched to Ge substrate. Optimization of device structure of such metamorphic Ga0.44In0.56P/Ga0.92In0.08As/Ge solar cell is important to increase its efficiency. In this work, two-dimensional simulation has been performed on the metamorphic Ga0.44In0.56P/Ga0.92In0.08As/Ge solar cell. Efficiency dependence of the Ga0.44In0.56P/Ga0.92In0.08As/Ge triple-junction solar cell on the base layer thickness and the InGaAs graded buffer layer thickness has been investigated. It has been found that the efficiency depends significantly on the thickness of the GaInP base layer. The metamorphic triple junction solar cell has hightest efficiency when the thicknesses of the GaInP base layer, the GaInAs base layer and the GaInAs graded buffer layer connecting the Ge substrate and GaInAs middle-cell are 0.35 μm, 2.5 μm and 0.15 μm, respectively.

Paper Details

Date Published: 12 October 2009
PDF: 9 pages
Proc. SPIE 7518, Photonics and Optoelectronics Meetings (POEM) 2009: Solar Cells, Solid State Lighting, and Information Display Technologies, 75180L (12 October 2009); doi: 10.1117/12.845428
Show Author Affiliations
Minghui Song, Huazhong Univ. of Science and Technology (China)
Hu Wang, Huazhong Univ. of Science and Technology (China)
Yankai Xiong, Huazhong Univ. of Science and Technology (China)
Yuqin Sun, Huazhong Univ. of Science and Technology (China)
Chenhui Yu, Huazhong Univ. of Science and Technology (China)
Zhihao Wu, Huazhong Univ. of Science and Technology (China)
Changqing Chen, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 7518:
Photonics and Optoelectronics Meetings (POEM) 2009: Solar Cells, Solid State Lighting, and Information Display Technologies
Michael Grätzel; Hiroshi Amano; Chin Hsin Chen; Changqing Chen; Peng Wang, Editor(s)

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