Thin film solar cells based on cavity enhanced grating structure

Guangyao Su; Fangwang Gou; Chuanhong Liu; Siyao Guo; Zhaoyu Zhang

doi:10.1117/12.2004034

25 March 2013 Thin film solar cells based on cavity enhanced grating structure

Guangyao Su, Fangwang Gou, Chuanhong Liu, Siyao Guo, Zhaoyu Zhang

Proceedings Volume 8620, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices II; 862022 (2013) https://doi.org/10.1117/12.2004034
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

A cavity enhanced one-dimensional grating structure is proposed to improve the light absorption within the α-Si thin film solar cell. Typically, dielectric or metal structure including gratings is added for the light absorption enhancement. Not only does the structure form the guided modes, and increase the surface area/surface angle, but also the thin film itself forms a cavity allowing light trapping for better absorption. However, the structure is optimized in these two mechanisms separately. In this paper, finite element method (FEM) was used to optimize thicknesses of two cavities and then combine them into a one –dimensional grating structure. Comparing to the flat thin film solar cell, we have get absorption enhancement factors of 1.12 and 1.51 normalized for the AM 1.5 spectrum for 300 nm to 950 nm by the two proposed structures.

Citation Download Citation

Guangyao Su, Fangwang Gou, Chuanhong Liu, Siyao Guo, and Zhaoyu Zhang "Thin film solar cells based on cavity enhanced grating structure", Proc. SPIE 8620, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices II, 862022 (25 March 2013); https://doi.org/10.1117/12.2004034

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KEYWORDS

Absorption

Thin film solar cells

Solar cells

Finite element methods

Resonance enhancement

Dielectrics

Polarization

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