Presentations

Very recent photoluminescence studies, investigating the tetragonal-to-orthorhombic phase transition of MAPbI3, demonstrated the presence of residual tetragonal phase far below the transition temperature, yielding spectral signatures from quantum confined tetragonal domains. We present a theoretical model of the coexistence of tetragonal and orthorhombic MAPbI3, based on tight binding simulations. The tight binding parameters are derived […]

Both x-ray diffraction (XRD) and photoluminescence (PL) characterizations of methylammonium lead iodide perovskite (MAPbI3) reveal signatures of a coexistence of the tetragonal and orthorhombic phases over a wide range of temperatures, suggesting that the phase transition does not happen sharply at a temperature of 164 K as reported in literature. To understand the causes of […]