Absorption enhancement in thin film a-Si solar cells with double-sided SiO2 particle layers

Author： Le Chen Qing-Kang Wang Xiang-Qian Shen Wen Chen Kun Huang Dai-Ming Liu

E-ISSN： 1741-4199|24|10|104201-104205

ISSN： 1674-1056

Source： Chinese Physics B, Vol.24, Iss.10, 2015-10, pp. : 104201-104205

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Abstract

Light absorption enhancement is very important for improving the power conversion efficiency of a thin film a-Si solar cell. In this paper, a thin-film a-Si solar cell model with double-sided SiO2 particle layers is designed, and then the underlying mechanism of absorption enhancement is investigated by finite difference time domain (FDTD) simulation; finally the feasible experimental scheme for preparing the SiO2 particle layer is discussed. It is found that the top and bottom SiO2 particle layers play an important role in anti-reflection and light trapping, respectively. The light absorption of the cell with double-sided SiO2 layers greatly increases in a wavelength range of 300 nm–800 nm, and the ultimate efficiency increases more than 22% compared with that of the flat device. The cell model with double-sided SiO2 particle layers reported here can be used in varieties of thin film solar cells to further improve their performances.