- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Theses and Dissertations /
- Development of the two-photon photoemission technique...
Open Collections
UBC Theses and Dissertations
UBC Theses and Dissertations
Development of the two-photon photoemission technique for the study of interfaces between metal substrates and thin conjugated polymer films Ament, Jessica Margaret
Abstract
This thesis examines the novel application of two-photon photoemission to the investigation of interfacial electronic structure between a metal substrate and a thin conjugated polymer film. Experimental considerations of the technique are discussed in detail. Theoretical aspects of employing the technique to study metal/conjugated polymer interfaces are compared to those of other, existing methodologies. Preliminary results from two-photon photoemission studies of poly(3-hexylthiophene) films on Au(111) substrates illustrate the ability of the technique to directly probe unoccupied interfacial states involved in electron transfer. The lowest unoccupied molecular orbital (LUMO) of poly(3-hexylthiophene) is found to lie 2.0eV above the Fermi level of the gold substrate, corresponding to a 0.8eV downward shift of the polymer energy levels upon interface formation. Results also illustrate the high sensitivity of the two-photon photoemission technique for studying these systems. A nearly 5000-fold increase in signal intensity from the polymer compared to the bare metal is attributed to the existence of long-lived excited states in the conjugated polymer.
Item Metadata
Title |
Development of the two-photon photoemission technique for the study of interfaces between metal substrates and thin conjugated polymer films
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
2001
|
Description |
This thesis examines the novel application of two-photon photoemission to the
investigation of interfacial electronic structure between a metal substrate and a thin
conjugated polymer film. Experimental considerations of the technique are discussed in
detail. Theoretical aspects of employing the technique to study metal/conjugated
polymer interfaces are compared to those of other, existing methodologies. Preliminary
results from two-photon photoemission studies of poly(3-hexylthiophene) films on
Au(111) substrates illustrate the ability of the technique to directly probe unoccupied
interfacial states involved in electron transfer. The lowest unoccupied molecular orbital
(LUMO) of poly(3-hexylthiophene) is found to lie 2.0eV above the Fermi level of the gold
substrate, corresponding to a 0.8eV downward shift of the polymer energy levels upon
interface formation. Results also illustrate the high sensitivity of the two-photon
photoemission technique for studying these systems. A nearly 5000-fold increase in
signal intensity from the polymer compared to the bare metal is attributed to the
existence of long-lived excited states in the conjugated polymer.
|
Extent |
4227089 bytes
|
Genre | |
Type | |
File Format |
application/pdf
|
Language |
eng
|
Date Available |
2009-07-23
|
Provider |
Vancouver : University of British Columbia Library
|
Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
|
DOI |
10.14288/1.0061489
|
URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
|
Graduation Date |
2001-05
|
Campus | |
Scholarly Level |
Graduate
|
Aggregated Source Repository |
DSpace
|
Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.