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  • Electrical characterization of silicon and silicon dioxide materials

    Creator:
    Sze, Wing-Il
    Abstract:
    The major goal of this research work was to develop better electrical measurements for the evaluation of silicon material quality. The first approach investigated was the Zerbst generation lifetime measurement technique. It was demonstrated that the error in the estimation of the generation lifetime obtained with this technique could be...
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    Dissertation
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    Electrical characterization of silicon and silicon

  • Recombination and generation lifetime characterization of p/p⁺ epitaxial silicon wafers

    Creator:
    Aminzadeh, Mehran G.
    Abstract:
    The refresh times of all dynamic charge storage devices, best characterized by the generation lifetime at roan temperature and the recombination lifetime at higher device operating temperatures (T>70°C), strongly influence the efficient and successful operation of dynamic charge storage devices such as DRAM's and CCD's. Both recombination and generation lifetime...
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    Dissertation
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    of p/p⁺ epitaxial silicon wafers AN ABSTRACT OF THE THESIS OF Mehran G. Aminzadeh for the degree

  • Electronic behavior of purified Selenium-rich alloys

    Creator:
    Kao, Shaw-shya
    Abstract:
    A great concern about the effect of oxygen in Se samples has been solved by a purification method called the distillation-with-Al method. The electrical conductivity of liquid Se prepared by this purification method shows Arrehnius behavior with a single activation energy and positive thermopower within the experimental temperature range. This...
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    Dissertation
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    complex can drift in an electric field, thus giving the character of an ionic liquid. The transport

  • Nonlinear terahertz spectroscopy of carbon nanomaterials and semiconductor nanostructures

    Creator:
    Paul, Michael Jason
    Abstract:
    This thesis will cover my work relating to the developing field of terahertz (THz) science and technology. It will present experimental and theoretical studies investigating the optical and electrical properties of various material systems using novel THz imaging and spectroscopy techniques. Due to its low photon energy, THz imaging and...
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    Dissertation
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    THz property of graphene that the sheet conductivity undergoes two- fold reduction when THz fields

  • Non-Stoichiometry in Bismuth Perovskite Solid Solutions

    Creator:
    Prasertpalichat, Sasiporn
    Abstract:
    The role of A-site non-stoichiometry was investigated in lead-free piezoelectric ceramics based on compositions in the 1-x(Bi₀.₅Na₀.₅TiO₃)-xBaTiO₃ system near the morphotropic phase boundary where x = 0.055, 0.06 and 0.07. The samples were prepared by a conventional solid state mixed oxide route with the A- site stoichiometry modified to incorporate...
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    Dissertation
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    consecutive electric pulses in positive and negative direction. A subtraction of polarization response from

  • Optoelectronic properties of organic semiconductor materials : from bulk to single molecule

    Creator:
    Shepherd, Whitney E. B.
    Abstract:
    The behavior and application of organic semiconductor materials depend strongly on their molecular structure, and molecular interactions. Several studies of intermolecular interactions in functionalized polyacene materials are presented. The degree and onset of aggregation of a functionalized anthradithiophene derivative was studied as a function of concentration in two different host...
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    Dissertation
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    dissociated via applied electric field. However, generally, the fields require to do so are high and the

  • NMR studies of CdF₂:Ga and CdF₂:Ga,Y

    Creator:
    Hilger, Derrick J.
    Abstract:
    Crystals of CdF₂:In and CdF₂:Ga reduced in a cadmium vapor exhibit unusual metastable properties that can be explained by a "negative U" model. This work uses NMR to investigate this model for CdF₂:Ga and CdF₂:Ga,Y and compare the results to optical measurements. Temperature dependent relaxation measurements were done on ¹¹³Cd...
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    Dissertation
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    property, however CdF2:Ga exhibits a higher metastable temperature (Suchocki et at., 1997; Wilamowski et

  • Structure and piezoelectric properties of lead-free bismuth-based perovskite solid solutions

    Creator:
    Huang, Chien-Chih
    Abstract:
    A new group of lead free piezoelectric perovskite solid solutions, (1-x)Bi(B'B")O₃-xABO₃, were obtained via solid-state processing techniques. The solubility of unstable perovskite Bi(B'B")O₃ compounds into stable perovskite compounds was found to be related to the tolerance factor of the ABO₃ perovskite endmembers. The morphotropic phase boundary (MBP) in perovskite solid...
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    Dissertation
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    …….......................................................................... 4.7. Strain-electric field measurements on (1-x)BZT-xBT ceramics obtained at room temperature

  • Electronic and Optical Properties of Organic Semiconductors : Experiment and Simulation

    Creator:
    Johnson, Brian
    Abstract:
    The continued development of organic semiconductor materials relies on an understanding of the relationship between optoelectronic properties, molecular structure, and molecular interaction. Several detailed studies of electronic properties in functionalized polyacene materials are presented. A computational model which allows the extraction of charge generation and transport properties from experimental data...
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    Dissertation
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    at varied electric fields. Insets show optical images of drop cast and spin cast films used in our

  • Scanning photocurrent microscopy study of photovoltaic and thermoelectric effects in individual single-walled carbon nanotubes

    Creator:
    DeBorde, Tristan
    Abstract:
    Carbon Nanotubes are a unique family of nanostructures that have shown remarkable promise for mechanical, electrical, and optical applications. Fundamentally similar to the earlier discovered Buckminsterfullerene (C₆₀), carbon nanotubes are hollow cylinders formed from a single sheet of carbon atoms. The research presented in this dissertation investigates several carbon nanotube...
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    for multiple nanomaterials including silicon nanowires, CNTs, graphene, and few layer molybdenum