Kinetic and thermodynamic modelling of ternary nanowire growth
Author
Summary, in English
In this perspective, a set of models that encompass a variety of aspects of ternary nanowire formation including their composition and crystal structure has been developed. Within the modelling both thermodynamic and kinetic approaches have been used.
The first model is based on two-component nucleation theory and describes the formation of the critical nucleus from a quaternary liquid. An analytic expression that links the compositions of the ternary nucleus and liquid particle is derived. The nucleus composition of four materials systems is discussed in details. Next, we explain how the surface energy influences the miscibility gap and the liquid-solid composition dependence during nucleation from a liquid melt.
The second model is based on the consideration of the incorporation rates of binary species into the monolayer and describes the evolution of the solid composition from the nucleated-limited composition to the kinetic one. The kinetic steady state regime is used to fit an experimental data set, namely the liquid-solid composition dependence obtained during growth of InxGa1-xAs nanowires in an environmental transmission electron microscope.
Finally, a model which describes the composition dependence of the zinc blende – wurtzite polytypism in ternary nanowires growing by the vapor-liquid-solid mechanism is developed.
Publishing year
2021
Language
English
Full text
Document type
Dissertation
Publisher
Solid State Physics, Lund University
Topic
- Condensed Matter Physics
Keywords
- III-V semiconductor materials
- ternary nanowires
- composition
- crystal structure
- modelling
- Fysicumarkivet A:2021:Leshchenko
Status
Published
Project
- Kinetic and thermodynamic modelling of ternary nanowire growth
Supervisor
ISBN/ISSN/Other
- ISBN: 978-91-8039-007-1
- ISBN: 978-91-8039-006-4
Defence date
29 October 2021
Defence time
09:15
Defence place
Lecture hall Rydbergsalen, Department of Physics, Sölvegatan 14, Faculty of Engineering LTH, Lund University, Lund. Zoom: https://lu-se.zoom.us/j/65213868705?pwd=eG54ditNelREdVFEei80ZXM3Z01jQT09
Opponent
- Faustino Martelli (Prof.)