基于频域有限差分法和入射光场在平板型和织构型非晶硅电池内的传输过程,详细分析了Ag背反镜的吸收性质.研究表明:导模振荡吸收和表面等离子体共振吸收是两种电池结构Ag背反镜的主要吸收机制;在长波段,平板型电池结构的导模振荡吸收和表面等离子体共振吸收均较弱,其Ag背反镜的吸收很小(小于3％),而织构型电池结构可产生较强的导模振荡吸收和表面等离子体共振吸收,其Ag背反镜的吸收较大(某些特殊波长的吸收达50％);织构型电池结构可有效拓展入射光单程通过有源层被完全吸收的波长范围.
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