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  • A 6% efficient MIS particulate silicon solar cell

    Creator:
    Greer, Michael R.
    Resource Type:
    Masters Thesis
    Full Text:
    A 6% efficient MIS particulate silicon solar cell AN

  • 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...
    Resource Type:
    Dissertation
    Full Text:
    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...
    Resource Type:
    Dissertation
    Full Text:
    THz property of graphene that the sheet conductivity undergoes two- fold reduction when THz fields

  • 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...
    Resource Type:
    Dissertation
    Full Text:
    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...
    Resource Type:
    Dissertation
    Full Text:
    property, however CdF2:Ga exhibits a higher metastable temperature (Suchocki et at., 1997; Wilamowski et

  • Transport properties of CuSc₁₋(subscript x)Mg(subscript x)O₂₊(subscript y) and BaCu₂S₂ transparent semiconductors

    Creator:
    Kykyneshi, Robert
    Abstract:
    Bulk properties of CuSc₁₋ₓMgₓO₂, CuSc₁₋ₓMgₓO₂₊y, BaCu₂S₂, Bai₁₋ₓKCu₂S₂, BaCu₂Se₂ and Bai₁₋ₓKₓCu₂Se₂ are investigated supporting the search for highly conductive p-type thin films. Mg is an efficient dopant in CuScO₂ with conductivity up to l.5.10⁻² S/cm. Oxidation of CuScO₂:Mg leads to further increase in conductivity up to 0.5 S/cm. The amount of...
    Resource Type:
    Masters Thesis
    Full Text:
    cold side there is a carrier build up, creating an electric field, which opposes the drift of

  • 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...
    Resource Type:
    Dissertation
    Full Text:
    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...
    Resource Type:
    Dissertation
    Full Text:
    for multiple nanomaterials including silicon nanowires, CNTs, graphene, and few layer molybdenum

  • Local field effects on dielectric properties of solids

    Creator:
    Canfield, Lingzhou Li
    Abstract:
    Local field effects on the dielectric properties of solids have been studied for three-dimensional and two-dimensional crystals by using two kinds of dipole models: an atomic dipole model in which dipoles coincide with atom sites and a bond dipole model in which dipoles are placed along bond directions. Local fields...
    Resource Type:
    Dissertation
    Full Text:
    electric field applied to a crystal will displace electronic charges and produce an internal polarization

  • First principles studies of optical, electronic and mechanical properties of organic molecules and solids

    Creator:
    Barras, Faye Lyn
    Abstract:
    This thesis presents the results of quantum-mechanical first principles calculations of optical, electronic and mechanical properties of organic molecules and solids, which have diverse potential applications such as photovoltaics, flexible electronics, and mechanical catalysts with applications in force sensors and self-healing materials. The electronic and optoelectronic properties of organic thin...
    Resource Type:
    Dissertation
    Full Text:
    temperatures.[1, 2] These materials also have poor conduc- tion of electric charge due to the weak electronic