Undergraduate Thesis Or Project
 

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

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  • 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 observed a change in the Seebeck coefficient, carrier density, and resistivity across the theoretically predicted phase transition between the orthorhombic and cubic structures of the alloy. Across the phase transition line, there is a decrease in resistivity from 10¹ to 10⁻² cm, a significant increase in the carrier density from 10¹⁷ to 10²¹ Ω cm⁻³, and a decrease in the Seebeck coefficient from 400 to 40 μV/K. At the phase transition composition, there is the maximum in the carrier density and the minimum in the resistivity and Seebeck coefficient due the non-linear change in the properties as a function of the calcium concentration. This non-linear scaling of the properties suggests a new avenue for manipulating semiconductor properties using heterostructural alloying.
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