Interplay of field-induced molecular dipole alignment and compensating surface polarization in low-temperature P-V hysteresis of MAPbBr3(001)
Journal
Physical Review Materials
Journal Volume
7
Journal Issue
5
Date Issued
2023-05-01
Author(s)
Freter, Lars
Hsu, Hung Chang
Sankar, Raman
Dunin-Borkowski, Rafal E.
Ebert, Philipp
Schnedler, Michael
Abstract
We demonstrate the presence of a hysteresis in tunneling spectra acquired at 4.3 K on cleaved MA-Br terminated (001) surfaces of MAPbBr3 single crystals. Simulations of the tunneling spectra reveal an underlying polarization-voltage (P-V) hysteresis, which is caused by an interplay of subsurface field-induced rotation and alignment of the MA molecules, stabilized by dipole-dipole interactions, and an ion-lattice relaxation. The resulting subsurface polarization is counteracted by a compensating surface polarization, detectable by surface-sensitive tunneling spectroscopy.
Subjects
PEROVSKITE SOLAR-CELLS; LEAD HALIDE PEROVSKITE; TUNNELING SPECTROSCOPY; ION MIGRATION; CH3NH3PBI3; QUANTIFICATION; DIFFUSION; EFFICIENT; BR
Publisher
AMER PHYSICAL SOC
Type
journal article