Investigation of substoichiometric inorganic halide perovskite powders for accelerated deposition

The aim of this project is to investigate the evolution of the crystallographic phase and detailed coordination environment of non-stochiometric inorganic halide perovskite powders upon heating under high vacuum (<10-6 mbar), mimicking the conditions during deposition by thermal evaporation. The powders will contain varying CsBr to PbI2 ratio (ball-milled admixtures of CsBr and PbI2) forming sub-stochiometric CsyPb(I2Bry)2+y. The aim of the envisaged experiments is to understand the transformation of the powders when exposed to the conditions they are used in the fabrication of halide perovskite thin-films (i.e. heated under high-vacuum).