一维和双层二维光子晶体太阳能电池背反射器  

Back Reflector of Solar Cells Consisting of One-dimensional Photonic Crystal and Double-layered Two-dimensional Photonic Crystal

作　　者：武振华[1] 李思敏[2] 张文涛[1] 高凤艳[1] 

机构地区：[1]桂林电子科技大学电子工程与自动化学院广西高校光电信息处理重点实验室,广西桂林541004 [2]广西科技大学,广西柳州545006

出　　处：《光子学报》2016年第2期159-163,共5页Acta Photonica Sinica

基　　金：广西自然科学基金(Nos.2014GXNSFGA118003;2013GXNSFDA019002);广西教育厅基金(No.ZD2014057);桂林市科学研究与技术开发项目(No.20140127-1)资助~~

摘　　要：利用a-Si∶H和SiO2等介质,设计了一种由一维光子晶体和双层二维光子晶体组成的非晶硅薄膜太阳能电池背反射器.利用时域有限差分法对该背反射器在入射光波长范围为300~1 100nm波段的反射率和透射率进行仿真,计算不同结构参量下非晶硅太阳能电池短路电流密度并进行比较分析,最终得到了最佳背反射器结构.结果表明：设计的太阳能电池背反射器能够有效地延长入射光在太阳能电池吸收层的传播路径,有助于缓解太阳能电池吸收层厚度对电池吸收效率的影响,提高了电池吸收层对入射光的吸收效率.一维光子晶体和双层二维光子晶体结构的背反射器可以大幅度提高电池的光捕获能力,将非晶硅薄膜太阳能电池的短路电流密度提高到31.96mA/cm2,较常用的Ag/ZnO背反射器结构非晶硅薄膜太阳能电池提高了51.0%.A highly efficient back reflector of amorphous silicon thin-film solar cells,which is consisting of one-dimensional photonic crystal and double-layered two-dimensional photonic crystal was designed by medium a-Si∶H and SiO2.The structure parameters of the back reflector were optimized by calculating its reflectivity and transmissivity at the range of 300~1 100 nm by the finite difference time domain method.The optimal structure was obtained by the calculation and comparison of the short circuit current density in different structural parameters.The results show that the propagation path of photon in the cells can be extended and it can help to reduce the influence of the absorption layer′s thickness on the efficiency of the cells,and improve the absorption efficiency of the battery.So the highly efficient back reflector can greatly enhance the capacity of light harvesting and improve the short circuit current density to 31.96 mA/cm2,which is increased by 51.0% comparing with the solar cell with metallic back reflector of Ag/ZnO that is widely used now.

关 键 词：光子晶体 反射器 时域有限差分 非晶硅薄膜太阳能电池 传播路径 反射率 光捕获 

分 类 号：O431[机械工程—光学工程]