Electrical Transport Measurements on the Alloy Sn₁-[subscript]xCa[subscript]xSe Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vt150p10p

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  • Hall measurements can be made on the unstudied alloy, Sn₁-[subscript]xCa[subscript]xSe to determine its electrical transport properties. The Sn₁-[subscript]xCa[subscript]xSe 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 measured with the Van der Pauw four contact method. The Hall apparatus measures the resistivity and Hall coefficient of the material. The carrier density and the Hall mobility are calculated from these values. For x = 0.2 concentrations the carrier density got up to 10²⁰/𝑐𝑚³ while the x = 0.1 concentrations went up to 10¹⁸/𝑐𝑚³ and lower. From these results, as the calcium concentration increases, the resistivity lowers and the carrier density increases. Further measurements of 0.2 concentrations grown at temperatures closer to the 300° C will be needed to establish a concrete trend.
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