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Martin Magnusson

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Quantitative laser diagnostics on trimethylindium pyrolysis and photolysis for functional nanoparticle growth

Author

  • Per Samuelsson
  • Martin H. Magnusson
  • Knut Deppert
  • Marcus Aldén
  • Zhongshan Li

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