The effect of methyl ammonium chloride doping for perovskite solar cells on structure, crystallization and power conversion efficiency.

The perovskite membrane with large particle size, uniform coverage and high quality is the prerequisite for the preparation of efficient and stable perovskite solar cells. Various additives have been used to increase the grain size and improve the film morphology and crystal quality. In this paper, methylammonium chloride (MACl) was proposed to obtain high crystalline quality of ( FAPbI 3) 0. 8 5 ( MAPbBr 3) 0. 1 5 perovskite absorption layer. The results show that the adding ammonium methyl chloride into the precursor of tricationic perovskite not only passivates surface defects to form high-quality and large-grain perovskite films, but also facilitates the formation of pure α -phase FAPbI 3 . Meanwhile, the designed perovskite precursor solutions were used to fabricate mesoporous perovskite solar cells (PSCs). Owing to the perovskite layer consisting of optimized MACl doping, the short-circuit current density (J sc ) of PSCs reaches 23.81 mA/cm2, which is 2.73 mA/cm2 higher than the primary ( FAPbI 3) 0. 8 5 ( MAPbBr 3) 0. 1 5 based on PSCs. The obtained power conversion efficiency (PCE) increases from 13.67% to 17.59%. [ABSTRACT FROM AUTHOR]