25 March 2013 Thin film solar cells based on cavity enhanced grating structure
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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.
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Guangyao Su, Guangyao Su, Fangwang Gou, Fangwang Gou, Chuanhong Liu, Chuanhong Liu, Siyao Guo, Siyao Guo, Zhaoyu Zhang, 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); doi: 10.1117/12.2004034; https://doi.org/10.1117/12.2004034

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