β-FeSi2 as the bottom absorber of triple-junction thin-film solar cells: A numerical study

被引：11

作者：

Yuan Ji-Ren ^{[1
,2
,3
]}

Shen Hong-Lie ^{[2
]}

Zhou Lang ^{[1
]}

Huang Hai-Bin ^{[1
]}

Zhou Nai-Gen ^{[1
]}

Deng Xin-Hua ^{[3
]}

Yu Qi-Ming ^{[3
]}

机构：

[1] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Peoples R China

[2] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Jiangsu, Peoples R China

[3] Nanchang Univ, Sch Sci, Nanchang 330031, Peoples R China

来源：

CHINESE PHYSICS B | 2014年 / 23卷 / 03期

基金：

中国国家自然科学基金;

关键词：

beta-FeSi2; solar cell; temperature coefficient; conversion efficiency; OPTICAL-ABSORPTION; PERFORMANCE;

D O I：

10.1088/1674-1056/23/3/038801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using beta-FeSi2 as the bottom absorber of triple-junction thin-film solar cells is investigated by a numerical method for widening the long-wave spectral response. The presented results show that the beta-FeSi2 subcell can contribute 0.273 V of open-circuit voltage to the a-Si/mu c-Si/beta-FeSi2 triple-junction thin-film solar cell. The optimized absorber thicknesses for a-Si, mu c-Si, and beta-FeSi2 subcells are 260 nm, 900 nm, and 40 nm, respectively. In addition, the temperature coefficient of the conversion efficiency of the a-Si/mu c-Si/beta-FeSi2 cell is -0.308 %/K, whose absolute value is only greater than that of the a-Si subcell. This result indicates that the a-Si/mu c-Si/beta-FeSi2 triple-junction solar cell has a good temperature coefficient. As a result, using beta-FeSi2 as the bottom absorber can improve the thin-film solar cell performance, and the a-Si/mu c-Si/beta-FeSi2 triple-junction solar cell is a promising structure configuration for improving the solar cell efficiency.

引用

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