Improving the thermoelectric performance of p-type PbSe via synergistically enhancing the Seebeck coefficient and reducing electronic thermal conductivity
2020
Huang, Zhiwei | Wang, Dongyang | Li, Caiyun | Wang, Jinfeng | Wang, Guangtao | Zhao, Li-Dong
In this work, the thermoelectric performance of p-type PbSe was improved dramatically by enhancing the Seebeck coefficient and reducing electronic thermal conductivity through CdTe alloying. CdTe alloying effectively increased the effective mass of p-type Pb₀.₉₈Na₀.₀₂Se due to band flattening and promoting the valence band convergence, which contributed to a high Seebeck coefficient of ∼238 μV K⁻¹ at 860 K and large power factor of ∼18.2 μW cm⁻¹ K⁻² at 860 K for Pb₀.₉₈Na₀.₀₂Se + 4% CdTe. Furthermore, CdTe alloying reduced the carrier mobility of Pb₀.₉₈Na₀.₀₂Se due to the enhanced scattering of impurity atoms, which results in a remarkable reduction of electronic thermal conductivity. As a result, due to its higher power factor and lower thermal conductivity, a high thermoelectric figure of merit ZT ∼1.5 at 860 K was achieved for Pb₀.₉₈Na₀.₀₂Se + 4% CdTe. This paper provides one novel approach to enhance the thermoelectric performance of p-type PbSe through synergistically manipulating electrical and thermal transport properties.
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