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Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp01vt150j469
Title: FERMI LEVEL TUNING IN TOPOLOGICAL INSULATORS: MOLECULAR DOPING OF Bi\(_{2}\)Te\(_{2}\)Se (BTS) SURFACES
Authors: Wild, William Harding
Advisors: Bernasek, Steven L.
Department: Chemistry
Class Year: 2014
Abstract: Fermi level tuning in Bi\(_{2}\)Te\(_{2}\)Se crystals is investigated with the use of X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. Spectra of clean BTS samples are compared with spectra after solution deposition of tetrachloro-o-benzoquinone and phenanthrenequinone at 0.5 mM, 1 mM, and 5 mM concentrations. XPS spectra of reacted samples display prominent oxidation features, consistent with chemisorbed quinone species. Tetrachloroobenzoquinone reacts to a greater extent with BTS surfaces than phenanthrenequinone. UPS spectra suggest Fermi level shifts on the order of 0.5 eV for 5 mM concentrations and indicate a possible trend of larger shifts corresponding to both increasing concentration and oxidative ability of the quinone.
Extent: 103 pages
URI: http://arks.princeton.edu/ark:/88435/dsp01vt150j469
Type of Material: Princeton University Senior Theses
Language: en_US
Appears in Collections:Chemistry, 1926-2016

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