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Sub-10 fs pump-probe experiments on methylammonium lead halide (MAPbI 3 ) perovskite films show hot exciton dissociation in 20 fs after photo-excitation with ~0.7 eV excess energy compared to its optical band gap (BG). Coherent wave packets were also detected in the form of spectral modulation, revealing electron-phonon coupling in these materials. The estimated electron-phonon coupling strengths from the frequency and amplitude of the detected spectral modulation are in the weak regime, suggesting formation of large polaron.

Monitoring hot exciton dissociation in hybrid lead halide perovskite films with sub-10 fs pulses