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Here, we report a peak ZT of 1.85 at 873 K for sulfur and Pb codoped polycrystalline SnSe by boosting electrical transport properties while suppressing lattice thermal conductivity. Compared to single sulfur doped samples, the carrier concentration is improved one order of magnitude by Pb incorporation, thereby contributing to improved electrical conductivity and power factor. Moreover, introducing of sulfur and Pb suppresses bipolar thermal conductivity by enlarging band gap. The lattice thermal conductivity was significantly reduced as low as 0.13 W m-1 K-1 at 873 K due to synergic approach involving suppressing bipolar thermal conductivity, large mass fluctuation induced by sulfur incorporation and nanoprecipitates. We demonstrate that combination of tailoring of band structure, suppressing bipolar thermal conductivity and introducing large mass fluctuation contributes high thermoelectric performance in SnSe. The high performance was achieved through boosting electrical transport properties while maintaining ultralow thermal conductivity. Our findings offer a new strategy for achieving high performance thermoelectric materials.
This article was published in the following journal.
Name: ACS applied materials & interfaces
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