超薄晶硅太阳电池表面介质纳米结构减反及陷光机理研究

RESEARCH ON ANTIREFLECTION AND LIGHT TRAPPING PROPERTIES FOR DIELECTRIC NANOSTRUCTURES ON ULTRATHIN CRYSTALLINE SILICON SOLAR CELLS

该文以实现宽谱减反、吸收增强的介质纳米结构织构化表面超薄晶硅太阳电池为目标,利用时域有限差分(FDTD)方法,系统仿真不同形貌纳米结构对太阳电池宽谱减反及吸收性能的影响。同时,借助仿真所得电场强度分布数据,进一步分析介质纳米结构织构化表面的超薄晶硅电池减反及陷光机理。结果表明:基于Mie共振散射、Fabry-Perot共振等多种模式的共同作用,表面制备介质纳米结构的超薄晶硅电池对入射光的吸收能力较表面制备单层减反层的电池大大提升,在部分波段甚至超过Yablonovitch界限。

This research is dedicated to the improvement of the dielectric nanostructures decorated ultrathin crystalline silicon(c-Si)solar cells with broadband antireflection and enhanced absorption ability.Finite difference time domain(FDTD)method is used to simulate the effects of nanostructures with different sidewall profile on the broadband antireflection and enhanced absorption ability for the solar cells.Further analysis is implemented for the antireflection and light trapping mechanisms of the dielectric nanostructures decorated ultrathin c-Si solar cells with the help of the simulated field intensity distribution data.The results show that the dielectric nanostructures decorated c-Si solar cells presented improved light absorptance ability compared with the single antireflection layer(SARL)decorated cells,owing to the combination of multiple modes including Mie resonance scattering,Fabry-Perot resonance,ect.,with the absorption even surpasses the Yablonovitch limit at some wavelengths range.