Chen Luzhou, Sha Wei E I, Choy Wallace C H
Department of Electrical and Electronic Engineering, the University of Hong Kong, Pokfulam Road, Hong Kong, China.
Opt Express. 2012 Mar 26;20(7):8175-85. doi: 10.1364/OE.20.008175.
We present designs of organic solar cells (OSCs) incorporating periodically arranged gradient type active layer. The designs can enhance light harvesting with patterned organic materials themselves (i.e. self-enhanced active layer design) to avoid degrading electrical performances of OSCs in contrast to introducing inorganic concentrators into OSC active layers such as silicon and metallic nanostructures. Geometry of the OSC is fully optimized by rigorously solving Maxwell's equations with fast and efficient scattering matrix method. Optical absorption is accessed by a volume integral of the active layer excluding the metallic absorption. Our numerical results show that the OSC with a self-enhanced active layer, compared with the conventional planar active layer configuration, has broadband and wide-angle range absorption enhancement due to better geometric impedance matching and prolonged optical path. This work provides a theoretical foundation and engineering reference for high performance OSC designs.
我们展示了包含周期性排列梯度型有源层的有机太阳能电池（OSC）的设计。与在OSC有源层中引入无机聚光器（如硅和金属纳米结构）相比，这些设计可以利用图案化有机材料本身增强光捕获（即自增强有源层设计），以避免降低OSC的电性能。通过使用快速有效的散射矩阵方法严格求解麦克斯韦方程组，对OSC的几何结构进行了全面优化。通过对有源层的体积积分（不包括金属吸收）来计算光吸收。我们的数值结果表明，与传统的平面有源层配置相比，具有自增强有源层的OSC由于更好的几何阻抗匹配和延长的光程，具有宽带和广角范围的吸收增强。这项工作为高性能OSC设计提供了理论基础和工程参考。
