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Permanent link (DOI): https://doi.org/10.7939/R3ZP3WB2S

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Ultrafast Terahertz Spectroscopy of Semiconducting Materials Open Access

Descriptions

Other title
Subject/Keyword
photovoltaics
terahertz technology
ultrafast terahertz spectroscopy
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Xu, Sijia
Supervisor and department
Hegmann, Frank (Physics)
Examining committee member and department
Beamish, John (Physics)
Beach, Kevin (Physics)
Brett, Michael (Electrical and Computer Engineering)
Hegmann, Frank (Physics)
Department
Department of Physics
Specialization

Date accepted
2013-09-27T14:30:04Z
Graduation date
2013-11
Degree
Master of Science
Degree level
Master's
Abstract
Terahertz spectroscopy is a powerful non-contact technique to study the optical and electric properties of materials at sub-picosecond time scales. In this study, ultrafast time-resolved terahertz spectroscopy was performed on both silicon-on-sapphire (SOS) and iron pyrite (FeS2) nano-crystalline films that have potential application in photovoltaics. Transient conductivity after photoexcitation with ultrashort optical pulses was studied by extracting the complex conductivity from the terahertz spectra. The Drude model provides an excellent fit to the photoconductivity of SOS excited at moderate pump fluences. However, at higher excitation fluences, the SOS exhibits some carrier localization that is best described by a Drude-Smith model. The photoconductivity of the FeS2 nanocrystalline film exhibits Drude-Smith behavior with very strong carrier localization, and is around 20% of the photoconductivity of SOS. The relationship between the Drude scattering time and the photocarrier density in both materials can be described by the Caughey-Thomas model.
Language
English
DOI
doi:10.7939/R3ZP3WB2S
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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