A novel surface-plasmon-enhanced structure is proposed to improve the absorption efficiency of organic solar cells in this paper. The PEDOT:PSS-Ag light-trapping structure introduced allows light to be reflected multiple times between the multilayer films, increasing the optical path length of light in the device and the light absorption by the absorption layer. The Ag film in P3HT:PCBM absorption layer can induce surface plasmons, which can enhance the electromagnetic energy around Ag film, improving the light absorption ability of organic solar cells. Based on the finite element method, the COMSOL-RF module is used to simulate the designed structure, and the absorption efficiency, electric field mode distribution and total power loss density distribution at different structural parameters were obtained. The results reveal that the absorption efficiency is more than 80% in the wavelength range of 485 nm to 520 nm in TE mode and more than 85% in the wavelength range of 495 nm to 595 nm in TM mode, providing a reliable basis for the development of high-performance organic solar cells.

本文提出了一种新型的表面等离子体增强结构，以提高有机太阳能电池的吸收效率。引入的PEDOT：PSS-Ag光陷获结构允许光在多层膜之间多次反射，从而增加了设备中光的光路长度以及吸收层的光吸收。P3HT：PCBM吸收层中的Ag膜可诱导表面等离子体激元，从而增强Ag膜周围的电磁能，提高有机太阳能电池的光吸收能力。基于有限元方法，使用COMSOL-RF模块对设计结构进行仿真，获得了不同结构参数下的吸收效率，电场模式分布和总功率损耗密度分布。