Improving the Performance of Air-Processed MAPbI₃-Perovskite Solar Cells through Defect Passivation with Copper(I) Halide Additives

The stability and large-scale production of perovskite solar cells depend on their manufacture ability under ambient conditions rather than a glovebox. The presence of defect states within the perovskite film is crucial in influencing the performance of solar cells. This study explores the effectiveness of copper(I) halide additives in mitigating the impact of defect states in the MAPbI3-based perovskite material. The findings of the study reveal that the inclusion of an ideal quantity of copper(I) halide additives in perovskite solar cells leads to a notable improvement in the performance when compared with the pristine MAPbI3-based perovskite. The analysis of time-resolved photoluminescence, transient photocurrent, and photovoltage indicates an extended lifespan of photogenerated charge carriers and their improved collection by the electrodes. The inclusion of copper(I) halide additives in perovskite solar cells results in a significant 24% boost in the short-circuit current density (Jsc), leading to an overall improvement in their performance (PCE) by 17%.