Synchronous Perovskite Crystallization Regulation and Buried Interface Modification Improve the Stability and Efficiency of a Planar Inorganic Perovskite Solar Cell.

The numerous defects in inorganic perovskites and inferior buried interfaces result in serious nonradiative recombination and energy loss, exacerbating the deterioration of the performance of inorganic perovskite solar cells. Here, we develop a facile strategy to simultaneously improve CsPbIBr perovskite quality by regulating perovskite crystallization and modify the buried interface by forming a 6-aminonicotinic acid (6AA) molecular interlayer through adding 6AA into a CsPbIBr precursor solution. It is found that adding 6AA into the CsPbIBr precursor effectively regulates the crystallization process of CsPbIBr perovskite because 6AA molecules exhibit a strong intermolecular interaction with CsPbIBr precursor components, resulting in forming a compact CsPbIBr perovskite film with improved morphology and decreased defects.