One-step spin-coating is a popular method for creating perovskite thin films, compatible with printing techniques. Achieving a homogeneous film morphology requires controlling the crystal growth rates of two precursors. However, the mechanisms of film formation and the role of solvate systems during spin-coating are not well understood. In this study, we used in situ grazing incidence wide-angle X-ray scattering to observe CH3NH3PbI3 perovskite material with various additives. These additives were designed to balance the crystal growth rates of CH3NH3I and PbI2. As expected, the solvate phase behavior was significantly influenced by the additives, with one particular additive effectively slowing the PbI2 solvate phase, thus balancing the crystal growth rates. As a result, the perovskite films produced had excellent morphology and high photovoltaic performance, with great reproducibility.-Scientific Journal cover design by scapiens

https://pubs.rsc.org/en/content/articlelanding/2020/ta/d0ta00048e#!divAbstract