1. Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla, Santiago, Chile;2. Instituto de Energía Solar and Dept. TFB, E.T.S.I. Telecomunicación, Universidad Politécnica de Madrid, Madrid, Spain;3. Escuela de Física, Universidad Industrial de Santander, Bucaramanga, Colombia
Abstract:
The excitons in the orthorhombic phase of the perovskite CH3NH3PbI3 are studied using the effective mass approximation. The electron–hole interaction is screened by a distance‐dependent dielectric function, as described by the Haken potential or the Pollmann–Büttner potential. The energy spectrum and the eigenfunctions are calculated for both cases. The results show that the Pollmann–Büttner model, using the corresponding parameters obtained from ab initio calculations, provides better agreement with the experimental results.
