Colloidal engineering of the precursor solution for the crystal-lization control and performance enhancement of CsPbI2Br perovskite
Inorganic CsPbI2Br perovskite has been considered as a promising light-harvesting material for applying in photovoltaic devices due to its high thermal stability and suitable bandgap.The high-quality CsPbI2Br perovskite films are the key factors for fabricating high-performance CsPbI2Br perovskite solar cells.Herein,a high-quality CsPbI2Br perovskite film is fabricated by controlling the crystallization process of CsPbI2Br perovskite by engineering the colloidal clusters of the precursor solution.Due to the strong coordinated interaction between the-SH group of 4-methoxybenzenethiol(MOBT)and the CsPbI2Br precursor component,MOBT introduction triggers the disassembly of the large colloidal clusters that can act as the crystal nuclei to promote perovskite crystallization,which therefore reduces the nucleation rate and retards the crystal growth of CsPbI2Br perovskite.As a result,a high-quality CsPbI2Br perovskite film with large grains,high crystallinity,and few defects is obtained.The as-assembled carbon-based CsPbI2Br perovskite solar cell without hole-transport layer delivers a high power conversion efficiency of 14.08％.These results demonstrate that the colloidal engineering of the precursor solution is a promising strategy for promoting the quality of inorganic perovskite and the performance of the resulting PSCs.
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