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Filtering by: Creator Eng, Kayleen S. Remove constraint Creator: Eng, Kayleen S. Advisor Tate, Janet Remove constraint Advisor: Tate, Janet Degree Name Bachelor of Science (B.S.) Remove constraint Degree Name: Bachelor of Science (B.S.)

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  • Temperature Dependence of Cu₃₋xSb₁₋[subscript y]M[subscript y]S₄ (M=Sn,Ge) Resistivity and Thermopower

    Creator:
    Mutch, Joshua
    Abstract:
    An experimental apparatus is modified to allow measurements of the Seebeck coefficient and resistivity to be taken simultaneously. This apparatus is designed for bulk and thin film samples between temperatures of 10 K and 300 K. The apparatus is constructed such that these simultaneous measurements do not interfere with each...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    Equation 1 above, S is the Seebeck coefficient, σ the electrical conductivity, T the absolute temperature

  • Optical Analysis of Titania : Band Gaps of Brookite, Rutile and Anatase

    Creator:
    Lance, Ryan A.
    Abstract:
    The optical transition in high-fraction polymorphs of titania (TiO2) were investigated to determine the band gap behavior of the most common polymorphs—brookite, rutile, and anatase—the values of which are varied in the literature. The direct optical band gaps of brookite, rutile, and anatase, were determined to be 3.37(7)eV, 3.41(11)eV and...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    values of the band gaps of TiO2’s polymorphs as shown in Table 1. TiO2 is usually assumed to be a direct

  • Development of a Brownian Motion Experiment for an Undergraduate Laboratory Course

    Creator:
    Wennstrom, Elena
    Abstract:
    A new class at Oregon State, PH 317: Experimental Physics, is designed to simulate a traditional laboratory research experience for undergraduate students. Several weeks of the class is devoted to Brownian motion experiments. Although this is a common topic for undergraduate lab classes, the experiment still needed some basic exploration...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    × 10−4 Pa· s. Equation 1.1 is often used to confirm the accuracy of a measurement system before

  • Scattering Mechanisms and Transport Properties of Semiconductors at Low Temperatures

    Creator:
    Kakepoto, Rohal
    Abstract:
    The purpose of this project is to verify scattering mechanisms in semiconductors by measuring transport properties and producing data that reflects existing research. The Hall effect is utilized to measure the resistivity, mobility and charge carrier concentration of the semiconductors: indium tin oxide (ITO), p-type silicon, and n-type silicon. By...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    Silicon The n-type silicon samples correlated closely with previous research done by Sheng S. Li for

  • Spectroscopic Ellipsometry on Thin Films of TiO2: Comparing Cauchy and Cody-Loretnz Models in CompleteEASE

    Creator:
    Kreb, Joseph
    Abstract:
    Spectroscopic ellipsometry (SE) is used to characterize amorphous and crystalline thin films of TiO2. Amorphous precursor films of TiO2 are deposited by radio frequency magnetron sputtering on fused silica and silicon substrates. Annealing the amorphous precursor films induces them to crystallize into either pure or mixed phases of the three...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    . [2] 3. Schematic diagram that illustrates the orientation of the p- and s-planes of polarization

  • Electrical Transport Measurements on the Alloy Sn₁-ₓCaₓSe

    Creator:
    Stahly, Joshua
    Abstract:
    Hall measurements can be made on the unstudied alloy, Sn₁-ₓCaₓSe to determine its electrical transport properties. The Sn₁-ₓCaₓSe samples were made by laser deposition into thin films and have a variable of calcium concentration x. These samples are approximately 250 nm in thickness, were grown at 366° C and are...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    37 0 2 4 6 8 10 12 0 2 4 6 8 10 H al l M o b ili ti e s (c m 2 / (V S) ) Magentic

  • Predicting the Percentage: Relating the Refractive Index to Effective Medium Theory in Combination Dielectric Films

    Creator:
    Farmer, Skylar
    Abstract:
    Transparent conductive oxides (TCO) are at the forefront of technology with their uses in touch screen phones and televisions, solar cells and more. Titanium dioxide and tin dioxide are two TCOs that have been studied in depth on their own, so to further explore these TCOs, this project focuses on...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    around since the 1960’s, which at the time used a single wavelength of light to measure the films in a

  • Characterizing Optical Signatures of TiO₂ Amorphous Precursors

    Creator:
    Berry, Patrick
    Abstract:
    TiO₂ typically crystallizes into three polymorphs: brookite, rutile, and anatase. The phase selection problem in TiO₂ is the lack of understanding what conditions cause amorphous TiO₂ to crystallize into one of its three polymorphs during an annealing process. It has been recently shown that phase selection in TiO₂ is highly...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    given by (α𝐸)s, where n is equal to 2, or ½, and 𝐸 is energy, typically given in electron-volts

  • Thermoelectric Properties of the HeterostructuralAlloy Sn_(1-x)Ca_(x)Se

    Creator:
    Forkner, MIchael
    Abstract:
    By alloying face centered cubic CaSe with orthorhombic SnSe, we created the heterostructural alloy Sn1-xCaxSe. The phase separated lms created with a high deposition temperature acted as highly crys- talline SnSe while the low deposition temperature lms acted as a mix of SnSe and CaSe. For the alloyed lms we...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    the ratio of the voltage difference to the temperature difference. S = −∆V ∆T (2.3) The negative

  • Determining thickness of zinc sulfide thin films through optical spectroscopy

    Creator:
    Prudell, Kathleen
    Abstract:
    A method has been developed to measure the thickness of ZnS thin films on Si using optical interference. Thin film optical interference fringes are dependent upon the thickness of the film, and for this reason the thickness can be determined by measuring reflectance spectrum of a thin film. A grating...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    multilayered films relies on two main matrices, the transfer matrix, M, and the scattering matrix, S. The