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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.
Formamidinium halide perovskites have intrinsic disorder in their inorganic structure, unlike methylammonium ones. This disorder impacts crystal dynamics and phase transitions, even at higher temperatures.
Area of Science:
- Materials Science
- Solid-State Physics
- Crystallography
Background:
- Halide perovskites are crucial for optoelectronic applications.
- Distinguishing between formamidinium and methylammonium perovskite structures is key for understanding their properties.
Purpose of the Study:
- To investigate the unique structural dynamics of formamidinium-based halide perovskites.
- To understand the role of intrinsic local static disorder in these materials.
Main Methods:
- Terahertz-range Raman scattering
- Single-crystal X-ray diffraction
- First-principles calculations
Main Results:
- Formamidinium-based crystals exhibit intrinsic local static disorder in their inorganic sublattice.
- This disorder coexists with a well-defined average crystal structure.
- Low-temperature disorder influences crystal dynamics and higher-temperature phase transitions.
Conclusions:
- Formamidinium and methylammonium halide perovskites possess distinct structural characteristics.
- Intrinsic disorder is a critical factor governing the behavior of formamidinium perovskites across temperatures.
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