High quality MAPbBr3 films via pulsed laser deposition of single-crystalline targets

Abstract

High quality MAPbBr₃ films were grown by pulsed laser deposition of single-crystalline targets using an on-axis geometry. The gas ambience up to the mbar range and laser fluence of some tenths of Joule per square centimeter yielded single α-phase polycrystalline MAPbBr₃ films, as revealed by ex situ XRD analysis. In situ low T studies allowed for the observation of cubic-to-tetragonal and of tetragonal-to-orthorombic phase transitions. Absorption and photoluminescence spectra show characteristic peaks around 2.35 eV. In particular, for thin films, PL measurements at low temperature showed narrow peaks characteristic of high crystalline quality and the absence of relevant defect-related recombination. The present results indicate a route to grow high quality thin films of metal halide perovskites via PLD of single-crystalline targets.