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

Author:

Kobbekaduwa KanishkaORCID,Shrestha Shreetu,Adhikari PanORCID,Liu ExianORCID,Coleman LawrenceORCID,Zhang JianbingORCID,Shi Ying,Zhou YuanyuanORCID,Bekenstein Yehonadav,Yan FengORCID,Rao Apparao M.ORCID,Tsai HsinhanORCID,Beard Matthew C.,Nie WanyiORCID,Gao JianboORCID

Abstract

AbstractWe 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 state dynamics, including trapping rates, de-trapping rates and trap properties, such as trap density, trap levels, and capture-cross sections. In this work we establish a foundation for trap dynamics in high defect-tolerant perovskites with ultra-fast temporal and ultra-high energetic resolution.

Funder

DOE | LDRD | Los Alamos National Laboratory

DOE | Office of Science

South Carolina Research Authority

Publisher

Springer Science and Business Media LLC

Subject

General Physics and Astronomy,General Biochemistry, Genetics and Molecular Biology,General Chemistry

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