Bart’s latest paper in Energy Technology has just gone online. In “Stable Cesium Formamidinium Lead Halide Pervskites: A comparioson of Photophysiscs and Phase Purity in Thin Films and Single Crystals”, he investigated the stability of metal halide peroskite compounds for use in solar cells.

Studying stable single crystals as well as thin films of identical composition, he and a team of Zernike researchers and collaborators from ETH Zurich found that increasing the bromine content in films of cesium formamidinium (FA) lead halide perovskite Cs0.1FA0.9PbI3-xBrx from x = 0.45 to 0.6 makes a big difference in purity: the film with more bromine has detrimental non-perovskite impurities.