Dynamics of internal electric field screening in hybrid perovskite solar cells probed using electroabsorption
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Electric fields arising from the distribution of charge in metal-halide perovskite solar cells are critical for understanding the many weird and wonderful optoelectronic properties displayed by these devices. Mobile ionic defects are thought to accumulate at interfaces to screen electric fields within the bulk of the perovskite semiconductor on application of external bias, but tools are needed to directly probe the dynamics of this process. Here, we show that electroabsorption measurements allow the electric field within the active layer to be tracked as a function of frequency or time. The magnitude of the electroabsorption signal, corresponding to the strength of the electric field in the perovskite layer, falls off for externally applied low-frequency voltages or at long times following voltage steps. Our observations are consistent with drift-diffusion simulations, impedance spectroscopy, and transient photocurrent measurements. They indicate charge redistribution on timescales ranging from 10 ms to 100 s, depending on the device interlayer material, perovskite composition, dominant charged defect, and illumination conditions. The method can be used on typical solar-cell structures and has the potential to become a routine characterization tool for optimizing hybrid perovskite devices.
Date Issued
2022-10-24
Date Acceptance
2022-08-30
Citation
Physical Review Applied, 2022, 18 (4)
ISSN
2331-7019
Publisher
American Physical Society
Journal / Book Title
Physical Review Applied
Volume
18
Issue
4
Copyright Statement
Published by the American Physical Society Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Fur ther distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
License URL
Identifier
http://arxiv.org/abs/2201.02175v1
Subjects
CH3NH3PBI3
CHEMISTRY
ELECTROPHOTOLUMINESCENCE
ELECTROREFLECTANCE
EXCITON BINDING-ENERGY
HYSTERESIS
ION CONDUCTION
METHYLAMMONIUM LEAD IODIDE
ORGANOMETAL TRIHALIDE PEROVSKITE
Physical Sciences
Physics
Physics, Applied
Science & Technology
TEMPERATURE-DEPENDENT ELECTROABSORPTION
Publication Status
Published
Article Number
044056
Date Publish Online
2022-10-24