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We investigate the electron-phonon coupling in CH3NH3PbX3 lead halideperovskites through the observation of Landau levels and high-order excitons atweak magnetic fields, where the cyclotron energy is significantly smaller thanthe longitudinal optical phonon energy. The reduced masses of the carriers andthe exciton binding energies obtained from these data are clearly influenced bypolaron formation. We analyze the field-dependent polaronic and excitonicproperties, and show that they can be quantitatively reproduced by the Frohlichlarge polaron model.

Polaron Masses in CH3NH3PbX3 Perovskites Determined by Landau Level Spectroscopy in Low Magnetic Fields