Open AccessOn the origin of spatially dependent electronic excited-state dynamics in mixed hybrid perovskite thin films
Author(s) -
YingZhong Ma,
Benjamin Doughty,
Mary Jane Simpson,
Sanjib Das,
Kai Xiao
Publication year - 2019
Publication title -
lithuanian journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.269
H-Index - 16
eISSN - 2424-3647
pISSN - 1648-8504
DOI - 10.3952/physics.v58i4.3877
Subject(s) - ultrafast laser spectroscopy , femtosecond , excited state , perovskite (structure) , relaxation (psychology) , chemical physics , absorption (acoustics) , materials science , phonon , thin film , molecular physics , optoelectronics , chemistry , condensed matter physics , nanotechnology , atomic physics , optics , crystallography , physics , laser , psychology , social psychology , composite material
The fundamental photophysics underlying the remarkable performance of organic-inorganic hybrid perovskites in optoelectronic device applications has been increasingly studied using complementary spectroscopic techniques. However, the spatially heterogeneous polycrystalline morphology of the solution-processed thin films is often overlooked in conventional ensemble measurements and therefore the reported results are averaged over hundreds or even thousands of nano- and micro-crystalline grains. Here, we apply femtosecond transient absorption microscopy to spatially and temporally probe ultrafast electronic excited-state dynamics in chloride containing mixed lead halide perovskite (CH 3 NH 3 PbI 3– x Cl x ) thin films. We found that the electronic excited-state relaxation kinetics are extremely sensitive to the spatial location probed, which was manifested by position-dependent transient absorption signal amplitude and decay behaviour, along with an obvious rise component at some positions. The analysis of transient absorption kinetics acquired at several distinct spatial positions enabled us to identify Auger recombination as the dominant mechanism underlying the initial portions of the spatially dependent dynamics with variable rate constants. The different rates observed suggest occurrence of distinct local electronic structures and variable contributions from impurities/defects and phonons in this nonlinear dynamical process.