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Thermochemical Study of CH3NH3Pb(Cl1-Br)3 Solid Solutions.

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  • 1Institute of Natural Sciences and Mathematics, Ural Federal University, 19 Mira St., Ekaterinburg 620002, Russia.

Materials (Basel, Switzerland)
|November 11, 2022
PubMed
Summary

Understanding the thermodynamic properties of hybrid perovskite halides is crucial for improving their stability in optoelectronic devices. This study reveals complex mixing enthalpies in CH3NH3Pb(Cl1-xBrx)3, driven by local strain and bonding interactions.

Keywords:
mixed halide perovskitesmixing enthalpymolecular dynamicsthermochemistry

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Area of Science:

  • Materials Science
  • Solid-state Chemistry
  • Chemical Thermodynamics

Background:

  • Hybrid organic-inorganic perovskites show promise for optoelectronic applications.
  • Stability issues, including sensitivity to oxygen, moisture, and light-induced phase separation, hinder their widespread use.
  • Thermodynamic properties are essential for understanding and improving perovskite stability.

Purpose of the Study:

  • To experimentally determine the thermodynamic properties of CH3NH3Pb(Cl1-xBrx)3 mixed halide solid solutions.
  • To elucidate the factors governing the stability and mixing behavior of these perovskite materials.
  • To provide insights into the compositional dependence of mixing enthalpy.

Main Methods:

  • Solution calorimetry was employed to experimentally measure thermochemical properties.
  • Molecular dynamics simulations were used in conjunction with experimental data.
  • Analysis focused on the enthalpy, entropy, and Gibbs free energy of mixing.

Main Results:

  • The study reports experimental thermochemical data for CH3NH3Pb(Cl1-xBrx)3.
  • A complex and irregular compositional dependence of mixing enthalpy was observed.
  • Molecular dynamics simulations revealed the interplay of local lattice strain, hydrogen bonds, and energetics.

Conclusions:

  • The intricate mixing enthalpy in these perovskite solid solutions arises from a combination of factors.
  • Understanding these thermodynamic drivers is key to designing more stable perovskite materials.
  • This research contributes to the fundamental knowledge required for advancing perovskite-based technologies.