Exploration of Microscopic Structure and Dynamics in Halide Perovskite and Perovskite−Inspired Materials with Solid-State NMR Spectroscopy

• Author / Creator

  Karmakar, Abhoy

• The work presented in this thesis describes the synthesis, structure, and optical properties of three different classes of halide-based perovskite materials, namely, metal halide perovskites of ABX3 type, halide double perovskites of A2B'B"X6 type, and “vacancy-ordered perovskites” of A2BX6 type that have recently been used in various applications, including photovoltaic solar cells, light-emitting diodes, photodetectors, hard radiation detectors, photocatalysis, and many more. The materials were prepared by conventional solvent-based synthesis, and solvent-free mechanochemical and high temperature synthesis routes. A thorough investigation of long- to short-range structural investigation has been undertaken for these materials to understand their complete structural motifs, where, powder X-ray diffraction is used to determine their average long-range structure and crystallinity, and solid-state nuclear magnetic resonance (NMR) spectroscopy is used to study their short (< 5 Å) and medium (5−10 Å) structure, dynamics (ion and polyhedral dynamics), degradation kinetics, and mechanisms of these materials. UV-vis-NIR diffuse reflectance spectroscopy has been used to determine the optical absorption properties and bandgap values for these polycrystalline materials, whereas steady-state and time-resolved photoluminescence spectroscopy have been used to understand their optical light emission properties.

• Subjects / Keywords

  • Chemistry
  • Perovskites
  • NMR
  • Materials
  • Structure
  • Spectroscopy

• Graduation date

  Spring 2022

• Type of Item

  Thesis

• Degree

  Doctor of Philosophy

• DOI

  https://doi.org/10.7939/r3-3r5b-5t39

• License

  This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.