提高太阳能电池光电转换效率的一个重要途径就是提高它的光子吸收能力。在传统非晶硅薄膜太阳能电池中加入了金属光栅，设计出一种新的复合电池结构。基于严格耦合波分析矢量衍射理论计算了该结构的吸收光谱和增强因子；讨论了光栅宽度、入射光角度和入射光偏振态对吸收的影响。结果显示，设计的太阳能电池结构能够显著提高光的吸收率，在TM偏振光入射条件下，该结构的吸收增强因子最高可达40%；在其他偏振态光线入射时，其吸收增强因子也可达到16%左右。

Enhancing optical absorption is an important way to improve the photoelectric conversion efficiency of solar cells. A new metal grating-based solar cell structure was designed. The absorption spectrum and enhancement factor were calculated by rigorous coupled wave analysis (RCWA) method. The influences on optical absorption induced by the grating width, the angle and polarized states of the incident light were discussed. The results show that the optical absorption factor in the designed structure can be greatly enhanced up to 40% when the incident wave is transverse magnetic (TM) polarized, and nearly 16% under other incident waves condictions. These indicates that the new solar cell structure can significantly improve the overall optical absorption compared to bare a-Si thin film solar cells.