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Permanent link (DOI): https://doi.org/10.7939/R34X54W70

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Characterization of Carrier Dynamics in Metal Oxide Nanostructures and Tellurophenes Open Access

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Other title
Subject/Keyword
Titania Nanotubes
Metal Oxide Nanostructures
Optoelectronics
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Wiltshire, Benjamin D
Supervisor and department
Shankar, Karthik (Electrical and Computer Engineering)
Examining committee member and department
Daneshmand, Mojgan (Electrical and Computer Engineering)
Shankar, Karthik (Electrical and Computer Engineering)
Cadien, Kenneth (Chemical and Materials Engineering)
Department
Department of Electrical and Computer Engineering
Specialization
Microsystems and Nanodevices
Date accepted
2017-09-25T09:19:18Z
Graduation date
2017-11:Fall 2017
Degree
Master of Science
Degree level
Master's
Abstract
Research was undertaken into the charge carrier dynamics of TiO2 nanotube and nanowire structures, which have potential in many technological applications and are already used in solar cells, OLED’s, photocatalysts, and biomedical applications. Using a combination of Time of Flight, Photoconductivity, IV, CV, and Time Resolved Microwave Conductivity, the charge carrier dynamics of TiO2 nanostructures were measured and later improved upon using a self-assembled monolayer surface for passivation, with mobility improving by a factor of almost 1000. The Time of Flight and Time Resolved Microwave Conductivity are explained in detail and can be used quickly, easily, and with a wide variety of materials to measure important material properties that are difficult to find using other methods. Organic Tellurophenes were also investigated using quantitative photoluminescence (PL) measurements such as quantum yield measurements and time resolved photoluminescence. The Tellurophenes were previously uncharacterized and only available in small quantitites. They were found to have unique properties such as triplet-decay leading to phosphorescent light emission which was tunable and with a relatively high quantum yield. The Tellurophenes were also found to have relatively high carrier mobilities after doping as high as 1.1×〖10〗^(-4) 〖cm〗^2 V^(-1) s^(-1).
Language
English
DOI
doi:10.7939/R34X54W70
Rights
This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for the purpose of private, scholarly or scientific research. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
Citation for previous publication
A. Mohammadpour, B. Wiltshire, Y. Zhang, S. Farsinezhad, A. Askar, R. Kisslinger, et al., "100-fold improvement in carrier drift mobilities in alkanephosphonate-passivated monocrystalline TiO2 nanowire arrays," Nanotechnology, vol. 28, p. 144001, 2017.G. He, W. Torres Delgado, D. J. Schatz, C. Merten, A. Mohammadpour, L. Mayr, et al., "Coaxing Solid‐State Phosphorescence from Tellurophenes," Angewandte Chemie International Edition, vol. 53, pp. 4587-4591, 2014.G. He, B. D. Wiltshire, P. Choi, A. Savin, S. Sun, A. Mohammadpour, et al., "Phosphorescence within benzotellurophenes and color tunable tellurophenes under ambient conditions," Chemical Communications, vol. 51, pp. 5444-5447, 2015.A. Mohammadpour, S. Farsinezhad, B. D. Wiltshire, and K. Shankar, "Majority carrier transport in single crystal rutile nanowire arrays," physica status solidi (RRL)-Rapid Research Letters, vol. 8, pp. 512-516, 2014.M. Zarifi, A. Mohammadpour, S. Farsinezhad, B. Wiltshire, M. Nosrati, A. Askar, et al., "Time-resolved microwave photoconductivity (TRMC) using planar microwave resonators: Application to the study of long-lived charge pairs in photoexcited titania nanotube arrays," The Journal of Physical Chemistry C, vol. 119, pp. 14358-14365, 2015.

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