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PhD Proposal by Diana LaFollette
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Diana LaFollette
Advisor: Prof. Juan-Pablo Correa-Baena
will propose a doctoral thesis entitled,
Crystallization Dynamics and Phase Transformations in
Lead Halide Perovskite Thin Film Processing for Solar Cell
Applications
On
Monday, December 11th at 1:30 p.m.
MRDC Room 3515
and/or
Virtually via Zoom
https://gatech.zoom.us/j/95524395755
Committee
Prof. Juan-Pablo Correa-Baena – School of Materials Science and Engineering (advisor)
Prof. Seung Soon Jang – School of Materials Science and Engineering
Prof. Matthew McDowell – School of Materials Science and Engineering
Prof. Natalie Stingelin – School of Materials Science and Engineering
Prof. Michael F. Toney – University of Colorado Boulder, Chemical and Biological Engineering
Abstract
Lead halide perovskites (LHPs) for perovskite solar cells have the potential to
revolutionize energy conversion with their high efficiencies, accessible precursors, and
relatively inexpensive processing. However, there are two main roadblocks to
commercialization: long term stability, related to the metastable nature of these
perovskite structures, and very specific processing requirements causing problems with
irreproducibility between research groups. The final efficiency and stability of the
perovskite solar cell is largely influenced by the crystal structure of the LHP in the
absorber layer. This crystal structure is influenced by a huge variety of factors from the
composition chosen, solvent used, annealing temperature, rest time between dissolving
precursor powders and spincoating, and many more. In this thesis, I will focus on
understanding crystallization and phase transformations mechanisms of mixed-cation
mixed-halide lead halide perovskites from the initial powders to final devices. Grazing
incidence wide angle X-ray scattering and X-ray diffraction will be used to understand
the crystal structure of final films. Transmission small angle X-ray scattering of
solutions will be used to understand formation of initial crystals in solution that then
translate to changes in crystal structure in the final film. X-ray fluorescence and
cathodoluminescence SEM will connect structure with physical morphology and optical
properties. First principles DFT calculations will be used to corroborate and explain
mechanisms proposed by experimental results.
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Status
- Workflow Status:Published
- Created By:Tatianna Richardson
- Created:11/28/2023
- Modified By:Tatianna Richardson
- Modified:11/28/2023
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