Investigations of the gallium nitride, aluminum nitride and indium nitride semiconductors: Structural, optical, electronic and interfacial properties

Described in this thesis is an investigation of some fundamental physical properties of both zincblende and wurtzite Group III - Nitride wide bandgap semiconductor materials. All of the thin films studied were grown by plasma-enhanced molecular beam epitaxy on either GaAs and SiC substrates. This growth method proved to be suitable for nitride expitaxial growth although compromises between the plasma power and the crystal growth rate had to be sought. The zincblende polytypes of GaN and InN were studied with the intent of evaluating their potential as a wide bandgap semiconductor system for short wavelength optical devices. The metastability of these crystals has led us to the conclusion that the zincblende nitrides are not a promising candidate for these applications due to their tendency to nucleate wurtzite domains. Bulk samples of zincblende GaN and InN and wurtzite GaN, AlN and InN were studied by x-ray photoemission spectroscopy (XPS) in an effort to determine their valence band structure. We report the various energies of the valence band density of states maxima as well as the ionicity gaps of each material. Wurtzite GaN/AlN and InN/AlN heterostructures were also investigated by XPS in order to estimate the valence band discontinuities of these heterojunctions. We measured valence band discontinuities of $\Delta$E$\rm\sbsp{v}{GaN/AlN}$ = 0.4 $\pm$ 0.4 eV and $\Delta$E$\rm\sbsp{v}{InN/AlN}$ = 1.1 $\pm$ 0.4 eV. Our results indicate that both systems have heterojunction band lineups fundamentally suitable for common optical device applications.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Strite, Samuel Clagett, III

Contributors dc:contributor

• Morkoc, Hadis

• Engineering, Electronics and Electrical
• Physics, Electricity and Magnetism
• Physics, Condensed Matter

Statement dc:rights

• Copyright 1993 Strite, Samuel Clagett, III

Language dc:language

eng

Identifier

AAI9329170
(UMI)AAI9329170

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/19071