基于FDFD方法周期结构的薄膜太阳能电池特性

Thin-film Solar Cell＇s Characteristic with Periodic Structure Based on FDFD method

利用非均匀媒质界面等效参量提取方案结合频域有限差分方法对周期结构薄膜太阳能电池的光学特性进行了数值分析及机理探究．结合等离子体共振条件，研究了两种设计结构的反射、传输、吸收特性及场分布特性，结果表明在低频点，介质和银分界面的场强明显增强，吸收明显增大．探讨了增强因子与结构、入射波长及入射角度间的关系，并分析了其内在的物理机理．结果表明，增强因子在低频时较大且随入射角度增大而增大，最大可达5．7．

Using the new inhomogeneous medium interface equivalent parameter scheme combined with the finite-difference frequency-domain method, numerical analysis on mechanism of the optical properties of the thin film solar cell with periodic structure was presented. The plasmon resonance condition was used to study the reflection, the transmission, the absorption characteristics, and the distribution of total field. In the low frequenee point, the enhancement of the total field is obviousat the interface of the medium layer and the Ag layer, and the absorption increases significantly. Furthermore, the relationship between the enhancement factor, the structure, the incident wavelength and the angle of incidence was discussed, and its intrinsic physical mechanism was also analyzed. The enhancement factor is very large at low frequency and increases with the enhancement of the incident angle. The results show that the enhancement factor can increaseto 5.7. The proposed research work can provide a relevant theory and technical reference for the design and optimization of the actual organic thin-film solar cells.