In-situ Additive Engineering of PbI2 Framework by Dopamine for Improving Performance of Mesostructure CH3NH3PbI3 Solar Cells

Additive-assisted interfacial engineering is a strategy to enhance the performance of perovskite solar cells (PSCs). A high-quality perovskite active layer, with defect-free, plays a key role in the performance of the solar cells. Herein, a dopamine hydrochloride (DA), as an organic ligand, was incorporated into the CH3NH3PbI3 perovskite precursor solution for modifying the microstructure of perovskite films and the photovoltaic properties of the PSCs. The result of the study indicated that the DA additive in perovskite precursor is a promising strategy for obtaining compact and uniform CH3NH 3PbI3 film, which can effectively reduce the recombination of charge carriers. The PSCs modified by the DA additive exhibited enhanced photovoltaic performance compared to the PSCs without modification. Optimum power conversion efficiency (PCE) of the PSCs significantly improved (13.57%) compared to that of the device without modification (10.22%). In addition, the PSCs with a 0.6 wt% DA in the perovskite precursor showed a satisfactory fabrication producibility compared to the pristine one. Therefore, this work presents a simple and effective way to develop reproducible and efficient PSCs by DA treatment.