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Enhancing the absorption capabilities of thin-film solar cells using sandwiched light trapping structures

机译:使用夹层光捕获结构增强薄膜太阳能电池的吸收能力

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摘要

A novel structure for thin-film solar cells is simulated with the purpose of maximizing the absorption of light in the active layer and of reducing the parasitic absorption in other layers. In the proposed structure, the active layer is formed from an amorphous silicon thin film sandwiched between silicon nanowires from above and photonic crystal structures from below. The upper electrical contact consists of an indium tin oxide layer, which serves also as an antireflection coating. A metal backreflector works additionally as the other contact. The simulation was done using a new reliable, efficient and generic optoelectronic approach. The suggested multiscale simulation model integrates the finite-difference time-domain algorithm used in solving Maxwell's equation in three dimensions with a commercial simulation platform based on the finite element method for carrier transport modeling. The absorption profile, the external quantum efficient, and the power conversion efficiency of the suggested solar cell are calculated. A noticeable enhancement is found in all the characteristics of the novel structure with an estimated 32% increase in the total conversion efficiency over a cell without any light trapping mechanisms. (C) 2015 Optical Society of America
机译:为了使有源层中的光吸收最大化并减少其他层中的寄生吸收,对薄膜太阳能电池的新型结构进行了仿真。在提出的结构中,有源层由从上方夹在硅纳米线与从下方夹在光子晶体结构之间的非晶硅薄膜形成。上部电触点由铟锡氧化物层组成,该铟锡氧化物层还用作抗反射涂层。金属后向反射器还可以用作另一个触点。仿真是使用一种新的可靠,高效且通用的光电方法完成的。所建议的多尺度仿真模型将用于求解麦克斯韦方程的三维时域有限差分时域算法与基于有限元方法的商用载运平台进行了集成,该平台用于载流子传输建模。计算了所建议的太阳能电池的吸收曲线,外部量子效率和功率转换效率。在没有任何光捕获机制的情况下,新型结构的所有特性均得到了显着增强,整个电池的总转换效率提高了32%。 (C)2015年美国眼镜学会

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