叠层结构是提高硅基薄膜电池效率和稳定性的有效方法，然而子电池电流不匹配使其效率的提升受到限制。为了提高叠层电池的子电池电流匹配度，需选择合适的中间层材料。通过硅基薄膜叠层电池的中间层的光学设计和理论计算，获得了材料折射率与厚度的匹配关系：中间层材料折射率n选取范围为1.59~3.1，中间层厚度d的制备范围为125/n~175/n nm，最佳厚度d为150/n nm。最优中间层材料的折射率和厚度应为：n约为1.59，d约为94.3 nm，采用这一条件可最大限度地提高硅基薄膜叠层电池的子电池电流匹配度。从叠层电池中间层的光学特性方面入手为实验研究提供了设计指导。

A tandem structure is decisive for improving the efficiency and stability of thin film silicon solar cells, however, the current mismatching between two sub cells limits the efficiency improvement. In order to improve the current matching, a suitable material is required as an interlayer. The matching relationship between refractive index and thickness of the interlayer material is obtained through optical design and theoretical calculation: the selection ranges of refractive index n and thickness d are 1.59~3.1 and 125/n~175/n nm, respectively; the optimum thickness d is 150/n nm. The optimal refractive index and thickness of the interlayer material to maximize the current matching are determined to be 1.59 and 94.3 nm. The results provide a guidance for experimental design from the aspect of optical properties of the interlayer in tandem solar cells.