Undergraduate Thesis Or Project
 

Variable Temperature Transport Measurements and Conduction Mechanisms of Crystalline and Amorphous Titanium Dioxide Thin Films

Public Deposited

Downloadable Content

Download PDF
Request Accessible Version
https://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/q524jw12r

Descriptions

Attribute NameValues
Creator
Abstract
  • The electrical properties of amorphous and crystalline titanium dioxide polymorphs are reported. Titanium dioxide is a widely used transparent semiconductor and it is a useful oxide model. Using variable temperature transport measurements of thin films, it was possible to establish the activation energy barrier for conduction. This was accomplished using an Arrhenius model. Typical activation energies were 14 - 353 meV and higher activation energies correlated with higher resistivity. To investigate the conduction mechanisms, Mott’s hopping conduction model also was applied, and I investigated these models for different temperature regimes. For films which could be described by Mott’s theory, the density of states was found. and most films had a density of states value of about 1017 eV-1cm-3. Both conduction mechanisms were seen in amorphous and crystalline films, but amorphous films predominantly exhibited hopping conduction. Resistivity was higher for films which were amorphous and for films which were crystalline, which warrants further investigation. The electrical properties did not distinguish TiO2 polymorphs from one another, and anatase does not appear to be the least conductive phase as I previously supposed.
Resource Type
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Rights Statement
Publisher
Peer Reviewed
Language
Accessibility Feature

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details PattersonAcacia2020.pdf 2020-05-27 Public Download