Phase transformation between CsPbBr₃ and Cs₄PbBr₆ nanocrystals by a cationic oligomeric ligand and water, and their water resistance

This article explores the origin of the significant water resistance of CsPbBr(3 )nanocrystals passivated by a cationic oligomeric ligand. Ligand exchange and X-ray photoemission spectroscopies indicate that a phase transformation between CsPbBr3 and Cs4PbBr6 is induced in the presence of the ligand and water, prolonging the duration of the nanocrystals.