In-situ additive engineering of PbI2 framework by dopamine for improving performance of mesostructure CH3NH3PbI3 solar cells

Abstract

Additive interfacial engineering is a strategy to enhance the performance of perovskite solar cells (PSCs). The high-quality perovskite active layer, with defect-free, plays a key role in the performance of the solar cells. In this paper, dopamine hydrochloride (DA), as an organic ligand was incorporated into the CH3NH3PbI3 perovskite precursor solution, and the effects of DA addition on the microstructure of perovskite films and the photovoltaic properties of the PSCs have been studied. It is found that the addition of DA in perovskite precursor is a promising strategy for obtaining compact and uniform CH3NH3PbI3 film, whic can effectively reduce the recombination of charge carriers. The PSCs grown with DA additive in perovskite precursor, significantly show enhanced photovoltaic performance. An optimum power conversion efficiency (PCE) of 13.57% with Voc (1.03 V), and good producibility compared to the pristine one was achieved in the PSCs with 0.6 wt% DA additive in the perovskite precursor.