Show simple item record

dc.contributor.authorBurrows, Steven Prestonen
dc.description.abstractWithin the â forbiddenâ range of electron energies between the valence and conduction bands of titanium dioxide, crystal lattice irregularities lead to the formation of electron trapping sites. These sites are known as shallow trap states, where â shallowâ refers to the close energy proximity of those features to the bottom of the semiconductor conduction band. For wide bandgap semiconductors like titanium dioxide, shallow electron traps are the principle route for thermal excitation of electrons into the conduction band.

The studies described here employ a novel infrared spectroscopic approach to determine the energy of shallow electron traps in titanium dioxide nanoparticles. Mobile electrons within the conduction band of semiconductors are known to absorb infrared radiation. As those electrons absorb the infrared photons, transitions within the continuum of the conduction band produce a broad spectral signal across the entire mid-infrared range. A Mathematical expression based upon Fermiâ Dirac statistics was derived to correlate the temperature of the particles to the population of charge carriers, as measured through the infrared absorbance. The primary variable of interest in the Fermi â Dirac expression is the energy difference between the shallow trap states and the conduction band. Fitting data sets consisting of titanium dioxide nanoparticle temperatures and their associated infrared spectra, over a defined frequency range, to the Fermiâ Dirac expression is used to determine the shallow electron trap state energy.

dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.subjectsurface stateen
dc.subjectshallow trap stateen
dc.subjectinfrared spectroscopyen
dc.subjectconduction band electronsen
dc.subjecttitanium dioxideen
dc.titleInfrared Spectroscopic Measurement of Titanium Dioxide Nanoparticle Shallow Trap State Energiesen
dc.description.degreeMaster of Scienceen of Scienceen Polytechnic Institute and State Universityen
dc.contributor.committeechairMorris, John R.en
dc.contributor.committeememberBrewer, Karen J.en
dc.contributor.committeememberLong, Gary L.en

Files in this item


This item appears in the following Collection(s)

Show simple item record