Thermoelectric Properties of the Heterostructural Alloy Sn_(1-x)Ca_(x)Se Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nc580n883

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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 coe cient, 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 signi cant increase in the carrier density from 1017 to 1021 cm􀀀3, and a decrease in the Seebeck coe cient from 400 to 40 V=K. At the phase transition composition, there is the maximum in the carrier density and the minimum in the resistivity and Seebeck coe cient 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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