Effect of Ionic liquids on 2D-3D Lead-based Perovskite Solar Cells

Ionic liquids have recently gained attention in the field of perovskite solar cells because of the enhanced efficiency and stability that they offer. Here, we study the effect of ionic liquid on both 3D, MAPbI3 and 2D-3D, PEA2MA4Pb5I16 lead based perovskite solar cells. A comparative analysis has been done to observe the enhancement in performance with and without the usage of ionic liquids. The material characterizations clearly show that an interlayer of ionic liquid causes no change in the morphology as well as the phase formation of the desired perovskite. Looking at the cell performance, we can observe a significant increase in the efficiency from 7.89 percent to 10.35 percent in the case when MAPbI3 was used as an absorber layer without and with an interlayer of ionic liquid 1 Butyl 3 methylimidazolium tetrafluoroborate respectively. Further, when PEA2MA4Pb5I16 was used as an absorber layer, the efficiencies were recorded to be 6.15 percent and 8.6 percent for the devices without and with an ionic liquid interlayer. The results show that ionic liquid can enhance the device performance for 2D-3D lead-halide perovskite solar cells.