Abstract
Abstract Preparing CH3NH3PbI3 perovskite solar cells from a low pure lead source is highly desirable for cutting down the fabrication cost of perovskite solar cells. To avoid the low solubility problem of low pure PbI2 source in the commonly used solvent, PbI2 first reacts with HI solution to produce highly soluble HPbI3 compound, then CH3NH3PbI3 perovskite film is obtained through a solid-gas reaction between HPbI3 film and CH3NH2 vapor. By optimizing the concentration of HPbI3 precursor solution, highly uniform perovskite films are obtained. Hole transport material free perovskite solar cells fabricated via this facile method exhibit an average power conversion efficiency of 12.90% and a maximum power conversion efficiency of 13.21%, which are comparable to the performances of perovskite solar cells prepared from high pure PbI2 sources.
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