logo SBA

ETD

Digital archive of theses discussed at the University of Pisa

 

Thesis etd-03082024-163542


Thesis type
Tesi di dottorato di ricerca
Author
LANDI, NOEMI
URN
etd-03082024-163542
Thesis title
Solid-State NMR methods for the study of Lead Halide Perovskites
Academic discipline
CHIM/02
Course of study
SCIENZE CHIMICHE E DEI MATERIALI
Supervisors
tutor Prof. Geppi, Marco
supervisore Dott.ssa Carignani, Elisa
Keywords
  • 2D Ruddlesden-Popper perovskites
  • lead halide perovskites
  • mixed-ion perovskites
  • perovskite nanocubes
  • solid-state NMR
  • SSNMR
  • triple-cation perovskites
Graduation session start date
13/03/2024
Availability
Withheld
Release date
13/03/2027
Summary
This project focuses on the application of Solid-State Nuclear Magnetic Resonance (SSNMR) to the study of lead halide perovskites (LHPs). LHPs have general formula APbX3, where A is an organic (e.g. methylammonium MA+, formamidinium FA+) or inorganic cation (e.g. Cs+) and X is a halide (I–, Br–, or Cl–). Their main attractive feature is their flexibility: optoelectronic properties can be tuned by changes in the composition, dimensionality, or geometry. Therefore, their structural characterization is fundamental. The advantage of SSNMR arises from the possibility of observing many different NMR-active isotopes, each having several spin properties sensitive to the nuclear environment as well as to interactions and dynamics.
In this thesis, state-of-the-art multinuclear solid-state NMR techniques, including both recordings of spectra and measurements of nuclear spin−lattice relaxation times (T1), were employed to investigate a 3D mixed-ion perovskite with chemical formula Cs0.05FA0.81MA0.14PbBr0.45I2.55, 2D Ruddlesden-Popper perovskites with chemical formula BA2MA(n-1)PbnI(3n+1) (with n=1, 2, 3, 4), and CsPbBr3 perovskite nanocubes.
File