Piezoelectric scattering of optical polaron in halide perovskites

TL;DR

This paper investigates how piezoelectric effects influence the mobility of optical polarons in halide perovskites, revealing temperature-dependent behaviors linked to phonon interactions and material symmetry.

Contribution

It introduces a detailed analysis of piezoelectric scattering mechanisms affecting optical polarons in halide perovskites, highlighting differences between intrinsic and photo-generated carriers.

Findings

Mobility varies with temperature differently in piezoelectric and non-piezoelectric phases.

Piezoelectric interactions significantly affect carrier mobility at low temperatures.

Carrier concentration influences mobility behavior depending on whether carriers are intrinsic or photo-generated.

Abstract

For the intrinsic carriers of MAPbBr$_{3}$, the temperature $T$ dependent mobility $\mu(T)$ of behaves like $\mu\propto T^{-1/2}$ in piezoelectric tetragonal phase, $\mu\propto T^{-1.4}$ in non-piezoelectric cubic phase. But for the photo-generated carriers in other halide perovskites ABX$_{3}$, $\mu\propto T^{-3/2}$ behavior is typical. Due to the strong interaction of carrier with longitudinal optical phonon, in ABX$_{3}$ the carriers mainly exist as optical polarons. The softness of ABX$_{3}$ renders it without inversion center in tetragonal phase, which allows piezoelectric effect at low carrier concentration. The variations of $\mu(T)$ behavior results from (1) the wave vector dependence of the piezoelectric interaction of polarons with acoustic phonons is different from that of ordinary polaron-acoustic phonon interaction; (2) the residual interaction of polaron with 2 longitudinal optical phonons can be ignored at low temperature, but is important at higher temperature; and (3) the concentration of intrinsic carriers is determined by temperature, while the concentration of photo-generated carriers is determined by the incident flux of photons.