ZnTe Alloying Effect on Enhanced Thermoelectric Properties of p-Type PbTe
2017
Ahn, Kyunghan | Shin, Hocheol | Im, Jino | Park, Sang Hyun | Chung, In
We investigate the effect of ZnTe incorporation on PbTe to enhance thermoelectric performance. We report structural, microscopic, and spectroscopic characterizations, ab initio theoretical calculations, and thermoelectric transport properties of Pb₀.₉₈₅Na₀.₀₁₅Te–x% ZnTe (x = 0, 1, 2, 4). We find that the solid solubility limit of ZnTe in PbTe is less than 1 mol %. The introduction of 2% ZnTe in p-type Pb₀.₉₈₅Na₀.₀₁₅Te reduces the lattice thermal conductivity through the ZnTe precipitates at the microscale. Consequently, a maximum thermoelectric figure of merit (ZT) of 1.73 at 700 K is achieved for the spark plasma-sintered Pb₀.₉₈₅Na₀.₀₁₅Te–2% ZnTe, which arises from a decreased lattice thermal conductivity of ∼0.69 W m–¹ K–¹ at ∼700 K in comparison with Pb₀.₉₈₅Na₀.₀₁₅Te.
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