中文摘要：

提出一种应用于非晶硅光伏电池表面的光陷阱结构,该结构主要由衍射光栅、低折射率MgF2膜层、高折射率ZnS膜层及金属Ag反射镜组成.在标准测试条件（AM1.5,100mW/cm2和25℃）下,运用严格耦合波理论,通过计算400—1000nm波段内的1μm厚非晶硅光伏电池的吸收光子数加权平均ξAM1.5,优化光陷阱结构的设计参数.结果表明：对于电池前表面减反射结构,在衍射光栅周期为800nm、高度为160nm、占空比为0.6125、MgF2和ZnS膜层厚度分别为90和55nm时,ξAM1.5达到74.3%;在电池背表面沉积ZnS/Ag膜层后,ξAM1.5增大到76.95%.因此,该光陷阱结构可以大幅度提高非晶硅光伏电池的光电转换效率.

英文摘要：

A highly efficient light-trapping structure consisting of a diffractive grating,a MgF2 film,a ZnS film and Ag reflector,is used for a-Si：H solar cell.Using the rigorous coupled wave theory,the weighted absorptance photon number （ξAM1.5） of a 1μm thick a-Si：H solar cell is calculated in a wavelength range from 400 to 1000 nm for the AM1.5 solar spectrum at 25℃.It is used to design the optimal parameters of the light-trapping structure.Results indicate that ξAM1.5 of the solar cell can reach 74.3%,if the period,the depth and the duty cycle of the diffractive grating,and the height of the MgF2 film and the ZnS film are 800 nm,160 nm,0.6125,90 nm and 55 nm,respectively.If a ZnS/Ag film is fabricated on the rear surface of the solar cell,a larger ξAM1.5 （76.95%） can be obtained.It is demonstrated that the trapping structure is useful for elevating the efficiency of the solar cell.