Chen Ke, Wu Rui, Zheng Hongmei, Wang Yuanyuan, Yu Xiaopeng
J Opt Soc Am A Opt Image Sci Vis. 2017 Nov 1;34(11):2000-2006. doi: 10.1364/JOSAA.34.002000.
We theoretically introduce a Si-based photovoltaic absorber with different grating profiles, which demonstrates a desirable enhancement of light absorption in the near-infrared region by increasing the degree of the grating's profile function. The mechanisms of light absorption enhancement originate from the synergetic effect of optical waveguide modes, light scattering, and Fabry-Perot resonances. Moreover, numerical results indicate that the convex grating structure is more conducive to the excitation of optical waveguide modes compared with the concave grating structure. The research findings can be utilized to guide the design of thin-film solar cells based on grating structures.
我们从理论上介绍了一种具有不同光栅轮廓的硅基光伏吸收体，通过增加光栅轮廓函数的程度，该吸收体在近红外区域展现出了理想的光吸收增强效果。光吸收增强的机制源于光波导模式、光散射和法布里 - 珀罗共振的协同效应。此外，数值结果表明，与凹面光栅结构相比，凸面光栅结构更有利于光波导模式的激发。这些研究结果可用于指导基于光栅结构的薄膜太阳能电池的设计。
