Index Catalog // ScholarsArchive@OSU

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

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

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

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

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

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

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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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

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

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

ScholarsArchive@OSU

Scattering Mechanisms and Transport Properties of Semiconductors at Low Temperatures

Development of a Brownian Motion Experiment for an Undergraduate Laboratory Course

Investigating Grain Boundaries in BaCuS1-xSexF Using Impedance Spectroscopy

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

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

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

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

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

Electrical Transport Measurements on the Alloy Sn₁-ₓCaₓSe

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

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