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Enhancing the Thermoelectric Performance of n-Type PbTe via Mn Doping
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张
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马
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DOI：10.3390/ma18051029.png)
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Abstract
En 中文
Significant strides have been made in enhancing the thermoelectric properties of p-type PbTe alloys, whereas the thermoelectric performance of n-type alloys lags behind that of p-type alloys, primarily owing to the difficulty of improving their Seebeck coefficient via band convergence. In this work, Mn was introduced into the n-type Pb0.985Sb0.015Te alloy, and Mn doping increases the absolute value of the Seebeck coefficient significantly by increasing the effective mass and reducing carrier concentration, resulting in a higher power factor of 20.8 mu W/K2cm being achieved for 0.5% Mn-doped sample at 573 K. Additionally, the decrease in electronic thermal conductivity, combined with the reduction in lattice thermal conductivity caused by the strengthened point defect scattering, leads to a significant decrease in the total thermal conductivity of the sample. And the lowest total lattice thermal conductivity of 1.16 Wm-1K-1 for a 2.0% Mn-doped sample has been achieved at 773 K. In the end, a maximum zT of 1.0 (773 K) and zTave of 0.62 (323-773 K) are attained in 1.0% Mn-doped Pb0.985Sb0.015Te alloy.
Keywords:
n-type PbTe
Mn doping
effective mass
strengthened point defect scattering
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