Martin Magnusson
Director of Bachelor's and Master's Studies
Quantitative laser diagnostics on trimethylindium pyrolysis and photolysis for functional nanoparticle growth
Author
Summary, in English
We report on an optical investigation of the pyrolysis and photolysis of trimethylindium (TMIn) as a typical metalorganic precursor for functional nanowire growth, aiming at an in-depth understanding of the governing chemistry and optimization of aerosol-based (aerotaxy) and epitaxial growth processes. A flow reactor with special consideration given to optical access was built to provide the chemical environment for in situ optical measurements on the pyrolysis and photolysis of TMIn. By probing a resonant transition of the indium atom, high-resolution laser absorption and laser-induced fluorescence spectroscopy were applied to obtain the atomic indium concentration at different chosen conditions in a spatially and temporally resolved manner. The results indicate that quantitative measurements of indium atoms under growth conditions are feasible. A 213 nm pulsed laser was employed to induce photolytic dissociation of TMIn vapor under chosen conditions. The photolytic dissociation of TMIn vapor with an ultraviolet laser turns out to be a promising method in generating substantial chemical effects, indicated by the generation of visible clouds of indium particles, and high concentrations of indium atoms far beyond the pyrolytically generated amount.
Department/s
- Combustion Physics
- Solid State Physics
- NanoLund: Centre for Nanoscience
Publishing year
2022-05
Language
English
Publication/Series
Measurement Science and Technology
Volume
33
Issue
5
Document type
Journal article
Publisher
IOP Publishing
Topic
- Atom and Molecular Physics and Optics
- Condensed Matter Physics
- Nano Technology
Keywords
- aerosols
- indium
- laser-induced fluorescence
- metalorganic vapor phase epitaxy
- photolysis
- pyrolysis
- trimethylindium
Status
Published
ISBN/ISSN/Other
- ISSN: 0957-0233