In-situ observation of trapped carriers in organic metal halide perovskite films with ultra-fast temporal and ultra-high energetic resolutions.

ABSTRACT: We in-situ observe the ultrafast dynamics of trapped carriers in organic methyl ammonium lead halide perovskite thin films by ultrafast photocurrent spectroscopy with a sub-25 picosecond time resolution. Upon ultrafast laser excitation, trapped carriers follow a phonon assisted tunneling mechanism and a hopping transport mechanism along ultra-shallow to shallow trap states ranging from 1.72-11.51 millielectronvolts and is demonstrated by time-dependent and independent activation energies. Using temperature as an energetic ruler, we map trap states with ultra-high energy resolution down to < 0.01 millielectronvolt. In addition to carrier mobility of ~4 cm²V^-1s^-1 and lifetime of ~1 nanosecond, we validate the above transport mechanisms by highlighting trap st

SUBMITTER: Kobbekaduwa K 

PROVIDER: S-EPMC7954808 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature