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• W2801707931 endingPage "725" @default.
• W2801707931 startingPage "717" @default.
• W2801707931 abstract "Pristine GeTe shows inferior thermoelectric performance around unit due to the large carrier concentration induced by the presence of intrinsic high concentration of Ge vacancy. In this study, we report a thermoelectric figure of merit ZT of 1.56 at 700 K, realized in Sb-doped GeTe based thermoelectric (TE) materials via combined effect of suppression of intrinsic Ge vacancy and Sb doping. The non-equilibrium nature during melt spinning process plays very important role. For one thing, it promotes the homogeneity in Ge1-xSbxTe samples and refines the grain size of the product. Moreover the persistent Ge precipitated as impurity phase in the traditional synthesis process is found to be dissolved back into the GeTe sublattice, accompanying with a drastic suppression of Ge vacancies concentration which in combination with Sb electron doping significantly reduced the inherent carrier concentration in GeTe. Low carrier concentration, approaching the optimum carrier concentration ∼3.74 × 10-20 cm-3 and a high power factor of 4.01 × 10-3 W m-1 K-2 at 750 K are achieved for Ge0.98Sb0.02Te sample. In addition, the enhanced grain boundary phonon scattering by refining the grain size through melt spinning (MS) process, coupled with the intensified alloying phonon scattering via Sb doping leads to low thermal conductivity of 1.53 W m-1 K-1 at 700 K for Ge0.94Sb0.06Te sample. All those contribute to a high ZT value, representing over 50% improvement in the ZT value compared to the Sb free samples, which provides an alternative way for ultrafast synthesis of high performance GeTe based thermoelectric material." @default.
• W2801707931 created "2018-05-17" @default.
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• W2801707931 date "2018-06-01" @default.
• W2801707931 modified "2023-10-17" @default.
• W2801707931 title "Realization of non-equilibrium process for high thermoelectric performance Sb-doped GeTe" @default.
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• W2801707931 doi "https://doi.org/10.1016/j.scib.2018.04.012" @default.
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• W2801707931 hasPublicationYear "2018" @default.
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