Fig. 4: Photo-induced carrier localization.
From: Photo-induced enhancement of lattice fluctuations in metal-halide perovskites
a The carrier mobility (μs, open squares) obtained from the fitted value of the momentum scattering time (τs). μavg is the carrier mobility calculated from the frequency-averaged photoconductivity (open circles). μdc represents the dc mobility (solid circles). b The ratio of μdc/μs = 1 − ϕϕb decreases with carrier density, indicating photo-induced carrier localization. Solid lines are exponential fits to the data of MA, FAMA and CsFAMA thin films, respectively. c Comparison of τs and ϕϕb between ground-state and excited-state together with the ground-state exciton binding energy (Rb0). The black arrows indicate photo-induced enhancement of electron-phonon coupling and lattice fluctuations. All error bars indicate a 95% confidence interval.
