Light trapping enhancement in thin f ilm silicon solar cells with dif ferent front and back grating periodicities  

作　　者：刘仁臣 夏子英 吴永刚 焦宏飞 梁钊铭 周建 

机构地区：[1]Institute of Precision Optical Engineering,Tongji University

出　　处：《Chinese Optics Letters》2013年第12期6-8,共3页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.60977028);the Key Project Foundation of Shanghai(No.09JC1413800)

摘　　要：Dual-grating structure thin-film silicon solar cells with different front and back grating periodicities are designed The geometrical parameters of both gratings are investigated. The reflection is greatly reduced by the front grating, whereas the absorption in the long wavelength is increased because of the back grating. The short circuit current of the combined structure is enhanced by 16.8% for a 1μm thick c-Si layer compared with that of the conformal grating structure. The short circuit current can be further increased by creating a relative lateral displacement between the front and back gratings. The displacement results in a more remarkably enhaneed absorption when the thickness of the aetive layer is reduced, indicating its importance in the design of ultra-thin high-efficiency solar cells.Dual-grating structure thin-film silicon solar cells with different front and back grating periodicities are designed The geometrical parameters of both gratings are investigated. The reflection is greatly reduced by the front grating, whereas the absorption in the long wavelength is increased because of the back grating. The short circuit current of the combined structure is enhanced by 16.8% for a 1μm thick c-Si layer compared with that of the conformal grating structure. The short circuit current can be further increased by creating a relative lateral displacement between the front and back gratings. The displacement results in a more remarkably enhaneed absorption when the thickness of the aetive layer is reduced, indicating its importance in the design of ultra-thin high-efficiency solar cells.

关 键 词：Diffraction gratings 

分 类 号：TM914.4[电气工程—电力电子与电力传动]