The Rotationally Free and Rigid Sublattices of the Single Crystal Perovskite CH3NH3PbBr3 (001): The Case of the Lattice Polar Liquid

Prescott E Evans, Maren Pink, Ayan A. Zhumekenov, Guanhua Hao, Yaroslav Losovyj, Osman Bakr, Peter A. Dowben, Andrew J. Yost

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The dynamic motion, within the lattice of single crystal CH3NH3PbBr3 (001) hybrid halide perovskite, was investigated using powder and single crystal x-ray diffraction, and x-ray photoemission spectroscopy. Single crystal x-ray diffraction studies indicate the methylammonium cation adopts multiple orientations within the crystal, at room temperature, evidence of a disordered methylammonium sublattice within a rigid and ordered PbBr3 matrix lattice. From the Br 3d5/2 core level photoemission temperature dependence, an effective Debye temperature of 160 ± 22 K can be estimated, while the Pb 4f7/2 core-level Debye-Waller factor plots suggest an effective Debye temperature of 202 ± 131 K, indicative of a very rigid lattice along the (001) direction. The combination of x-ray diffraction with temperature dependent x-ray photoemission spectroscopy for bromine and lead core level peaks support the characterization of CH3NH3PbBr3 as a lattice polar liquid crystal, as CH3NH3PbBr3 does not meet the criteria required for a ferroelectric material.
Original languageEnglish (US)
Pages (from-to)25506-25514
Number of pages9
JournalThe Journal of Physical Chemistry C
Volume122
Issue number44
DOIs
StatePublished - Oct 23 2018

Fingerprint Dive into the research topics of 'The Rotationally Free and Rigid Sublattices of the Single Crystal Perovskite CH3NH3PbBr3 (001): The Case of the Lattice Polar Liquid'. Together they form a unique fingerprint.

Cite this