Sha Wei E I, Choy Wallace C H, Wu Yumao, Chew Weng Cho
Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China.
Opt Express. 2012 Jan 30;20(3):2572-80. doi: 10.1364/OE.20.002572.
We investigate both optical and electrical properties of organic solar cells (OSCs) incorporating 2D periodic metallic back grating as an anode. Using a unified finite-difference approach, the multiphysics modeling framework for plasmonic OSCs is established to seamlessly connect the photon absorption with carrier transport and collection by solving the Maxwell's equations and semiconductor equations (Poisson, continuity, and drift-diffusion equations). Due to the excited surface plasmon resonance, the significantly nonuniform and extremely high exciton generation rate near the metallic grating are strongly confirmed by our theoretical model. Remarkably, the nonuniform exciton generation indeed does not induce more recombination loss or smaller open-circuit voltage compared to 1D multilayer standard OSC device. The increased open-circuit voltage and reduced recombination loss by the plasmonic OSC are attributed to direct hole collections at the metallic grating anode with a short transport path. The work provides an important multiphysics understanding for plasmonic organic photovoltaics.
我们研究了将二维周期性金属背光栅用作阳极的有机太阳能电池（OSC）的光学和电学性质。采用统一的有限差分方法，建立了用于等离子体有机太阳能电池的多物理场建模框架，通过求解麦克斯韦方程组和半导体方程（泊松方程、连续性方程和漂移扩散方程），将光子吸收与载流子传输和收集无缝连接起来。由于激发的表面等离子体共振，我们的理论模型有力地证实了金属光栅附近显著不均匀且极高的激子产生率。值得注意的是，与一维多层标准有机太阳能电池器件相比，激子产生的不均匀性确实不会导致更多的复合损失或更小的开路电压。等离子体有机太阳能电池开路电压的增加和复合损失的减少归因于在具有短传输路径的金属光栅阳极处的直接空穴收集。这项工作为等离子体有机光伏提供了重要的多物理场理解。
