Chen Ke, Wu Rui, Zheng Hongmei, Wang Yuanyuan, Yu Xiaopeng
Appl Opt. 2018 Jul 1;57(19):5348-5355. doi: 10.1364/AO.57.005348.
We present a theoretical crystalline silicon thin-film solar cell with concave quadratic bottom gratings using parametric design of the gratings and systematically perform optoelectronic simulations of the proposed grating structures. Numerical results reveal that the concave quadratic grating structure leads to a desirable enhancement of light absorption in the near-IR region (750-1100 nm), and this enhancement is dominated by TE-polarized light. The mechanisms of light absorption enhancement under TE-polarized light are based on the hybrid effect of optical waveguide modes and Fabry-Perot modes. Moreover, research results indicate that the concave quadratic grating structure has excellent light-focusing effects, which is conducive to the excitation of optical waveguide modes. The study findings can be utilized to improve the efficiency of thin-film solar cells based on grating structures.
我们提出了一种具有凹二次底部光栅的理论晶体硅薄膜太阳能电池，通过对光栅进行参数设计，并对所提出的光栅结构进行系统的光电模拟。数值结果表明，凹二次光栅结构导致近红外区域（750 - 1100纳米）光吸收的理想增强，并且这种增强主要由TE偏振光主导。TE偏振光下光吸收增强的机制基于光波导模式和法布里 - 珀罗模式的混合效应。此外，研究结果表明，凹二次光栅结构具有优异的光聚焦效果，这有利于光波导模式的激发。该研究结果可用于提高基于光栅结构的薄膜太阳能电池的效率。
