Effect of doping on the phase stability and photophysical properties of CsPbIBr perovskite thin films.

In this study, we demonstrate that the crystallization process of CsPbIBr films can be modulated when small amounts of additives are added to the precursor solution, leading to the formation of the bright brownish α-phase perovskite films with high orientation along the [100] crystallographic direction. Doped CsPbIBr films exhibit improved crystallinity, with high coverage, large grain size and pinhole-free surface morphology, suitable for making high performance optoelectronic devices. We also explored the role of Cl in the photophysical properties of CsPbIBr perovskite films using the temperature dependent photoluminescence technique.