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Updated: Aug 12, 2025
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Static and Dynamic Disorder in Formamidinium Lead Bromide Single Crystals
Guy Reuveni1, Yael Diskin-Posner2, Christian Gehrmann3
1Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot76100, Israel.
Abstract:
We show that formamidinium-based crystals are distinct from methylammonium-based halide perovskite crystals because their inorganic sublattice exhibits intrinsic local static disorder that coexists with a well-defined average crystal structure. Our study combines terahertz-range Raman scattering with single-crystal X-ray diffraction and first-principles calculations to probe the evolution of inorganic sublattice dynamics with temperature in the range of 10-300 K. The temperature evolution of the Raman spectra shows that low-temperature, local static disorder strongly affects the crystal structural dynamics and phase transitions at higher temperatures.
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