Tight binding simulations of tetragonal MAPbI 3 domains within orthorhombic phase

Very recent photoluminescence studies, investigating the tetragonal-to-orthorhombic phase transition of MAPbI 3 , 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 MAPbI 3 , based on tight binding simulations. The tight binding parameters are derived by particle swarm optimization and the band-offset between the two crystals is obtained by first-principles calculations. The impact of the tetragonal domain dimension on the optical properties of MAPbI 3 is discussed.