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Coupling between Ion Drift and Kinetics of Electronic Current Transients in MAPbBr3 Single Crystals
Marisé García-Batlle1, Javier Mayén Guillén2, Marian Chapran3
1Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain.
ACS Energy Letters
|March 21, 2022
Summary
Investigating methylammonium lead tribromide perovskites reveals ion migration influences electronic currents. This study quantifies ion mobility, crucial for understanding optoelectronic device performance.
Area of Science:
- Materials Science
- Solid-State Physics
- Optoelectronics
Background:
- Halide perovskites exhibit promising optoelectronic properties but their complex ionic-electronic nature hinders mechanism elucidation.
- Understanding ion migration is key to optimizing perovskite-based devices.
Purpose of the Study:
- To investigate and quantify ion migration in methylammonium lead tribromide single crystals.
- To elucidate the relationship between ionic kinetics and electronic current behavior.
Main Methods:
- High-reproducibility measurement of long-time current transients in methylammonium lead tribromide single crystals.
- Sample biasing experiments to study ionic drift and voltage-dependent mobility.
- Application of the ionic dynamic doping (IDD) model for ion diffusion analysis.
Main Results:
- Ion migration process was definitively proven through reproducible current transient measurements.
- Ionic drift exhibited voltage dependence (∝ V-3.5), explained by a ballistic-like voltage-dependent mobility (BVM) model.
- Ionic mobility was estimated at ~10-6 cm2 V-1 s-1, showing negligible ionic current but significant influence on electronic current via charge density modulation.
Conclusions:
- Ionic migration significantly impacts the long-time electronic current in halide perovskites.
- The study provides a quantitative model for ion migration and mobility in methylammonium lead tribromide.
- Findings offer insights for designing stable and efficient perovskite optoelectronic devices.
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