Speaker
Description
The metal halide perovskites (MHPs) are attracting intense research interest due to their excellent optoelectronic properties. The all-inorganic member CsPbBr$_3$ is of particular interest for gamma-ray detector applications and LEDs. Further, single crystals can be grown via a solution route or by a melt process, and thin films can be solution processed or produced by vapour deposition.
Here we report the results of two-component density functional theory (TC-DFT) calculations for CsPbBr$_3$ and the results from variable-energy positron annihilation lifetime spectroscopy measurements on a range of single crystal CsPbBr3 samples as well as vapour processed thin samples. The TC-DFT calculations return positron lifetime values approximately similar to those previously reported for the model MHP MAPbI$_3$. Evidence for the detection of both B-site and A-site vacancy defects is presented.
