nz1c02578_si_001.pdf (749.28 kB)
Coupling between Ion Drift and Kinetics of Electronic Current Transients in MAPbBr3 Single Crystals
journal contribution
posted on 2022-02-11, 09:33 authored by Marisé García-Batlle, Javier Mayén Guillén, Marian Chapran, Oriane Baussens, Julien Zaccaro, Jean-Marie Verilhac, Eric Gros-Daillon, Antonio Guerrero, Osbel Almora, Germà Garcia-BelmonteThe optoelectronic
properties of halide perovskite materials have
fostered their utilization in many applications. Unravelling their
working mechanisms remains challenging because of their mixed ionic–electronic
conductive nature. By registering, with high reproducibility, the
long-time current transients of a set of single-crystal methylammonium
lead tribromide samples, the ion migration process was proved. Sample
biasing experiments (ionic drift), with characteristic times exhibiting
voltage dependence as ∝ V–3/2, is interpreted with an ionic migration model obeying a ballistic-like
voltage-dependent mobility (BVM) regime of space-charge-limited current.
Ionic kinetics effectively modify the long-time electronic current,
while the steady-state electronic currents’ behavior is nearly
ohmic. Using the ionic dynamic doping model (IDD) for the recovering
current at zero bias (ion diffusion), the ionic mobility is estimated
to be ∼10–6 cm2 V–1 s–1. Our findings suggest that ionic currents
are negligible in comparison to the electronic currents; however,
they influence them via changes in the charge density profile.
History
Usage metrics
Categories
Keywords
sample biasing experimentshalide perovskite materialsion migration procession diffusion ),time current transientstime electronic currentelectronic current transientscharge density profileionic drift ),3 sub2 supion driftelectronic currentsrecovering currentlimited currentionic mobilityionic currentsv ∼ 10zero biasvia changesoptoelectronic propertiesnearly ohmicmany applicationslike voltagehigh reproducibilityfindings suggestdependent mobility