设计了一种具有光栅结构砷化镓吸收层的薄膜太阳能电池, 利用严格耦合波方法分析了矩形光栅和双层矩形光栅结构砷化镓吸收层在280～900 nm入射波长范围内的吸收效率.分析表明：在吸收层厚度一定的条件下, 矩形光栅结构相比于平坦形吸收层的吸收率有较大提高;双层矩形光栅吸收效果更为明显, 其对可见光的吸收率在较大波长范围内比单层矩形光栅提高了至少10%, 比平坦形提高了至少20%.可见通过结构设计, 光子在光栅内随机反射增加了光在吸收层的作用时间和距离, 增强了吸收层对光的吸收率, 进而提高薄膜太阳能电池的光电转换效率.

A thin film solar cell with a grating in the layer was designed to increase the absorption of gallium arsenide thin-film layer.By using rigorous coupled wave method,the absorption efficiency in the range of 280~900 nm was analyzed for GaAs layer with single and double rectangular gratings.When the thickness of absorption layer obtained under certain circumstances,the rate of absorption compared to the rectangular grating structure of the non patterned absorber layer was greatly improved.The absorption rate of double rectangular grating increased by at least 10% over single rectangular grating and 20% over non patterned,which is more obvious.The results indicate that,by designing the structure,random reflection photonic in grating increases the effect of time and distance in the light absorption layer,enhanced the absorption rate and finally improve the photoelectric conversion efficiency of the thin film solar cell.