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- W2897035937 abstract "Bi2Te3-based materials are a representative thermoelectric system operating near ambient temperature. Their n-type family is very limited and underperforms the p-type counterpart, which is a major concern in the thermoelectric community. Here we report that alkali earth metals (AE = Mg, Ca, Sr, Ba) in Group 2 unusually induce n-type thermoelectric properties in Bi2Te3. Mg is the most efficient electron donor among them. The x = 0.01 sample of MgxBi2-xTe3 (x = 0.005, 0.01, 0.015) system exhibits remarkably enhanced power factor and ZT of ~0.8 at 350 K in comparison with pristine Bi2Te3. The improved performance is attributed to simultaneously enhanced electrical conductivity and reduced lattice thermal conductivity. Remarkably, MgxBi2-xTe3 materials show larger Seebeck coefficients than those expected by the theoretical Pisarenko relation." @default.
- W2897035937 created "2018-10-26" @default.
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- W2897035937 date "2019-01-01" @default.
- W2897035937 modified "2023-10-05" @default.
- W2897035937 title "Unusual n-type thermoelectric properties of Bi2Te3 doped with divalent alkali earth metals" @default.
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- W2897035937 doi "https://doi.org/10.1016/j.jssc.2018.10.012" @default.
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