Index Catalog // ScholarsArchive@OSU

Variable Temperature Transport Measurements and Conduction Mechanisms of Crystalline and Amorphous Titanium Dioxide Thin Films

Creator:: Patterson, Acacia M.
Abstract:: The electrical properties of amorphous and crystalline titanium dioxide polymorphs are reported. Titanium dioxide is a widely used transparent semiconductor and it is a useful oxide model. Using variable temperature transport measurements of thin films, it was possible to establish the activation energy barrier for conduction. This was accomplished using...
Resource Type:: Undergraduate Thesis

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

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

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

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

Repair of a Scanning Tunneling Microscope and Retesting for the Formation of Pyramidal Structures Formed on Sputtered Germanium (110)

Creator:: Betz, Hazel R.
Abstract:: Semiconducting materials are of immense importance due to their presence in almost all modern devices. It is possible that the surface physics of semiconductors could be used to control the nanoscale topography and properties of these materials, ultimately creating new options for device fabrication. This could result in profound implications...
Resource Type:: Undergraduate Thesis
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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

Optical Modelling of Thin Films: Applying Effective Medium Theory to Mixtures of TiO₂ and SnO₂

Creator:: Wulf, Julian J.
Abstract:: This study used SCOUT optical modelling software to create models of the reflectance and transmittance spectra generated by mixtures of titanium dioxide (TiO2) and tin oxide (SnO2). These models enabled identification of how altering the ratio of a mixture changes the optical response. By being able to identify how altering...
Resource Type:: Undergraduate Thesis

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

Observation of the third harmonic sinusoidal voltage response of a small incandescent lightbulb

Creator:: Hutchings, Scott
Abstract:: This thesis looks at the third harmonic voltage response of a small incandescent lightbulb. The third harmonic voltage, or 3 omega (3ω) voltage, arises from applying a 1ω sinusoidal voltage across a resistive material. The 3ω voltage carries with it information about the thermal conductivity of the material. A lock-in-amplifier...
Resource Type:: Presentation and Undergraduate Thesis

Measurement and Modeling of Zinc Sulfide Thin Films using Ellipsometry and Reflection Spectroscopy : A Comparison of Optical Characterization Techniques

Creator:: Kratzer, Aaron and Kratzer, Aaron C.
Abstract:: Zinc sulfide thin films on silicon wafers were analyzed for layer thickness, refractive index, and absorption using reflection spectroscopy (RS), spectroscopic ellipsometry (SE), and modeling programs. RS and refractive index values from literature were used to model film thickness based on reflection and the SCOUT modeling program was used to...
Resource Type:: Undergraduate Thesis

Investigating Grain Boundaries in BaCuS1-xSexF Using Impedance Spectroscopy

Creator:: Horgan, Briony
Abstract:: Impedance spectroscopy is a method of modeling materials with equivalent circuits to determine electrical properties, such as the resistivity and the dielectric constant. We explore impedance spectroscopy, both theoretically and experimentally through applying the method to samples of BaCuS1-xSexF. Grain boundary effects were dominant in the results, and although they...
Resource Type:: Undergraduate Thesis

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

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

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

Detecting ZnS Thin Films on Si Substrates using X-Ray Diffraction

Creator:: Howorth, Benjamin
Abstract:: The goal of this research is to determine whether x-ray diffraction (XRD) is a viable method for resolving ZnS thin films on Si substrates. The samples are ZnS thin films of thickness between 50nm and 100nm, on Si substrates that are 0.5mm thick. ZnS and Si have nearly identical lattice...
Resource Type:: Undergraduate Thesis

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

ScholarsArchive@OSU

Variable Temperature Transport Measurements and Conduction Mechanisms of Crystalline and Amorphous Titanium Dioxide Thin Films

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

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

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

Scattering Mechanisms and Transport Properties of Semiconductors at Low Temperatures

Repair of a Scanning Tunneling Microscope and Retesting for the Formation of Pyramidal Structures Formed on Sputtered Germanium (110)

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

Optical Modelling of Thin Films: Applying Effective Medium Theory to Mixtures of TiO₂ and SnO₂

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

Observation of the third harmonic sinusoidal voltage response of a small incandescent lightbulb

Measurement and Modeling of Zinc Sulfide Thin Films using Ellipsometry and Reflection Spectroscopy : A Comparison of Optical Characterization Techniques

Investigating Grain Boundaries in BaCuS1-xSexF Using Impedance Spectroscopy

Electrical Transport Measurements on the Alloy Sn₁-ₓCaₓSe

Development of a Brownian Motion Experiment for an Undergraduate Laboratory Course

Determining thickness of zinc sulfide thin films through optical spectroscopy

Detecting ZnS Thin Films on Si Substrates using X-Ray Diffraction

Characterizing Optical Signatures of TiO₂ Amorphous Precursors

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