金属光栅会激发表面等离子激元，促进光吸收，将金属光栅引入PTB7∶PC70BM有机太阳能电池中，通过优化金属光栅形状，可增强电池的光吸收效率。本文使用有限元方法，研究了在活性层的底部置入不同形状金属光栅，例如方形，椭圆形以及圆形，后器件的光吸收效率。研究结果发现，方形光栅可以使活性层的总吸收率从平板结构的29%提高到52.9%，提高的幅度最大，椭圆形光栅次之，提高到49%，圆形光栅提高的最小，提高到45%。
The surface plasmon resonance was excited by metallic grating introduced into the organic solar cells, which made absorption increasing. The absorption of PTB7∶ PC70BM organic solar cells were improved by different optimized metallic grating. In this paper,enhancement absorption rate on condition metallic grating with different shape were studied by finite element method, such as square grating, circular grating, eliptic grating, was placed at the bottom of the active layer. The result reveal that the square grating can make the total active layer absorption increased to 52. 9% from 29%,compared with the planar device. The enhancement absorption is most obvious. Next to the square grating, the eliptic grating improve to 49%. Circular grating has little effect on the absorption of the active layer, increased to 45%.
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