Correlation between morphology and charge carrier dynamics for solubility of methylammonium lead halide in efficient perovskite photovoltaics

Although many efforts have been made to achieve a uniform perovskite film, the use of CH3NH3I:PbI2:DMSO (1:1:1) has been limited. This is because the intermediate phase and crystal phase can coexist in the precursor solution.[1] To solve this, a complex process was inevitably needed to ensure the uniformity.[2] Here, the quality of CH3NH3PbI3 film is simply improved via controlling nonstoichiometric molar ratio.[3] The uniform and dense perovskite layer was successfully fabricated by controlling the perovskite adduct formation. This demonstrated a critical point to improve current density and power conversion efficiency in perovskite photovoltaics. The synergistic effect of morphology and electrical properties has proved the optimized solubility for generating high current densities in inverted perovskite solar cells [1] L. Xie et al., Phys. Chem. Chem. Phys., 2017, 19, 1143 [2] K. Fu et al., Nanoscale, 2016, 8 4181 [3] B. G. Kim et al., Sol. Energy Mater. Sol. Cells, 2019, 192, 24