Light-Management Mechanisms of Optimized Micro-Textured Foils in Perovskite Solar Cells

Numerical simulations were employed to investigate the impact of micro-textured light management foils applied on top of an example planar perovskite solar cell, both under direct and diffuse illumination conditions. A detailed optimization of texture features revealed that the optimized Tetrahedral texture enables the greatest enhancement of the device performance, reaching a 16.3 % boost of JSC compared to the non-textured cell. Further on, by studying the influence of the individual light management mechanisms, we observed that this enhancement is primarily enabled by efficient trapping of the light reflected from the back side of the cell and by redirecting it back towards the perovskite layer where it can be further absorbed. Therefore, this internal light trapping effect has been indicated as the dominant light management mechanism of the investigated micro-textured foils.