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, 1926-2017