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Australian National University

1. Wang, Naiyin. Shape engineering of InP nanostructures for optoelectronic applications .

Degree: 2021, Australian National University

III-V semiconductor nanowires have been the research focus in the past two decades thanks to the superior properties of the materials themselves and the unique properties produced by reducing the dimension to the nanoscale. Despite the great successes, these one-dimensional (1D) nanostructures still face many challenges. Surprisingly, it has been demonstrated that nanostructures with more complex two- and three-dimensional (2D and 3D) shapes can provide possible solutions. This dissertation presents the shape engineering of InP-based nanostructures from 1D nanowires to more sophisticated 2D and 3D shapes. First, InP nanostructures grown on {111}A InP substrates was first investigated. Two key growth parameters, temperature and V/III ratio, were studied to optimise the growth conditions. We found that a higher growth temperature was crucial to obtain high quality nanostructures. Under optimal growth conditions, the highly uniform arrays of wurtzite (WZ) InP nanostructures with tunable shapes, such as nanowires, nanomembranes, prism- and ring-like nanoshapes, were simultaneously achieved. In-depth investigation of shape transformation with time and opening geometry/dimension revealed that the shape was essentially determined by pattern confinement and minimisation of total surface energy. A theoretical model was proposed to explain the observed behaviour. Structural and optical characterisation results demonstrated that all the different InP nanostructures grown under optimal conditions have perfect wurtzite (WZ) crystal structure regardless of their shape and strong and homogeneous photon emission. Moreover, we investigated the shape evolution from branched nanowires to vertical/inclined nanomembranes and crystal structure of InP nanostructures grown on InP substrates of different orientations, including {100}, {110}, {111}B, {112}A and {112}B. Two growth models were proposed to explain these observations regarding shape transformation and phase transition. A strong correlation between the growth direction and crystal phase was revealed. Specifically, WZ and zinc-blende (ZB) phases form along the <111>A and <111>B directions, respectively, while crystal phase remains the same along other low-index directions. The polarity-induced crystal structure difference was explained by thermodynamic difference between the WZ and ZB phase nuclei on the {111}A and {111}B planes. Growth from the openings was essentially determined by pattern confinement and minimisation of the total surface energy, similar to growth on {111}A InP substrates. Accordingly, a novel type-II WZ/ZB nanomembrane homojunction array was obtained by tailoring growth directions through alignment of the openings along certain crystallographic orientations. Finally, the incorporation of InAsP quantum well was carried out on pure WZ InP nanostructure templates grown on {111}A InP substrates with two different shapes, i.e. nanowires and nanomembranes. InAsP quantum wells grew both axially and laterally on the InP nanowires and nanomembranes. While the axial…

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APA (6th Edition):

Wang, N. (2021). Shape engineering of InP nanostructures for optoelectronic applications . (Thesis). Australian National University. Retrieved from http://hdl.handle.net/1885/218983

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Wang, Naiyin. “Shape engineering of InP nanostructures for optoelectronic applications .” 2021. Thesis, Australian National University. Accessed January 16, 2021. http://hdl.handle.net/1885/218983.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Wang, Naiyin. “Shape engineering of InP nanostructures for optoelectronic applications .” 2021. Web. 16 Jan 2021.

Vancouver:

Wang N. Shape engineering of InP nanostructures for optoelectronic applications . [Internet] [Thesis]. Australian National University; 2021. [cited 2021 Jan 16]. Available from: http://hdl.handle.net/1885/218983.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang N. Shape engineering of InP nanostructures for optoelectronic applications . [Thesis]. Australian National University; 2021. Available from: http://hdl.handle.net/1885/218983

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.