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Stabilizing Polar Domains in MAPbBr

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High pressure transforms methylammonium lead bromide (MAPbBr3) structures, altering organic ion behavior from liquid-like to ordered stacks. Hydrogen bonds and C-H···Br interactions are key to these pressure-induced phase transitions.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemical Crystallography

Background:

  • Metal-halide perovskites, such as methylammonium lead bromide (MAPbBr3), are promising materials for optoelectronic applications.
  • Understanding their structural response to external stimuli like pressure is crucial for device stability and performance.

Purpose of the Study:

  • To investigate the pressure-induced structural phase transitions of MAPbBr3 at room temperature.
  • To elucidate the behavior of methylammonium (MA) ions and their orientational dynamics under hydrostatic pressure.

Main Methods:

  • Ab initio molecular dynamics simulations were employed to study MAPbBr3 under pressures ranging from 0 to 2.8 GPa.
  • Analysis focused on structural changes, molecular dipole orientations, and hydrogen bonding interactions.

Main Results:

  • Two distinct phase transitions were observed at 0.7 GPa (cubic to cubic) and 1.1 GPa (cubic to tetragonal).
  • MA dipoles transitioned from isotropic to oblate nematic behavior, with orientational fluctuations confined to a crystal plane.
  • Above 1.1 GPa, MA ions formed ordered stacks with static disorder, leading to polar and antipolar domains, and CH3 torsional motion was suppressed.

Conclusions:

  • Pressure significantly alters the crystal structure and molecular dynamics of MAPbBr3.
  • Hydrogen bonding and C-H···Br interactions play a critical role in mediating host-guest coupling and driving the observed phase transitions.