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Static and Dynamic Disorder in Formamidinium Lead Bromide Single Crystals.

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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.

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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.