研究目的
To understand the formation behavior of CH3NH3PbI3 thin films with various deposition rates of PbI2 first layer using a sequential vacuum evaporation method (SVE) and to investigate the presence of an intermediate phase and CH3NH2 molecular defects.
研究成果
The study confirms the formation of CH3NH3PbI3 thin films with tiny grains and a CH3NH2-incorporated intermediate state using the SVE method. The presence of this intermediate state and molecular defects may contribute to the relatively low power conversion efficiency of vacuum-evaporated perovskite solar cells.
研究不足
The study is limited to the characterization of thin films formed by the SVE method and does not explore the performance of these films in solar-cell applications. The exact nature of the intermediate phase and its impact on device performance remains unclear.
