Structured surfaces are used to reduce reflection and enhance light-trapping in silicon solar cells. In this simulation study, we investigated the relationship between the refractive index of front-side coupling structures on top of planar wafer-based crystalline silicon solar cells and the light-trapping performance of the structures. A crossed diffraction grating with a period of 1 μm and random pyramid structures with varying refractive indices were considered. Simulations were carried out both at the cell level and at the complete module stack level. It is shown that the single pass light path enhancement factor (LPEF) only provides a rough estimate of the light-trapping properties. The light-trapping behavior can only be reliably assessed in the complete system level and these results deviate from the estimated single pass LPEF. It can also be shown that the refractive index of the structure strongly influences the light-trapping behavior.

中文翻译：

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折射率对硅太阳能电池耦合结构的影响

结构化表面用于减少反射并增强硅太阳能电池中的光陷阱。在此仿真研究中，我们研究了基于平面晶片的晶体硅太阳能电池顶部的正面耦合结构的折射率与该结构的光捕获性能之间的关系。考虑了周期为1μm的交叉衍射光栅和具有变化折射率的随机金字塔结构。在单元级别和整个模块堆栈级别都进行了仿真。结果表明，单程光路增强因子（LPEF）仅提供了对光陷波特性的粗略估计。只能在整个系统级别上可靠地评估光陷阱行为，并且这些结果与估计的单程LPEF有所不同。