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- W3160494927 abstract "Abstract Eco-friendly SnTe based thermoelectric materials are intensively studied recently as candidates to replace PbTe; yet the thermoelectric performance of SnTe is suppressed by its intrinsically high carrier concentration and high thermal conductivity. In this work, we confirm that the Ag and La co-doping can be applied to simultaneously enhance the power factor and reduce the thermal conductivity, contributing to a final promotion of figure of merit. On one hand, the carrier concentration and band offset between valence bands are concurrently reduced, promoting the power factor to a highest value of ∼2436 µW·m −1 ·K −2 at 873 K. On the other hand, lots of dislocations (∼3.16×10 7 mm −2 ) associated with impurity precipitates are generated, resulting in the decline of thermal conductivity to a minimum value of 1.87 W·m −1 ·K −1 at 873 K. As a result, a substantial thermoelectric performance enhancement up to zT ≈ 1.0 at 873 K is obtained for the sample Sn 0.94 Ag 0.09 La 0.05 Te, which is twice that of the pristine SnTe ( zT ≈ 0.49 at 873 K). This strategy of synergistic manipulation of electronic band and microstructures via introducing rare earth elements could be applied to other systems to improve thermoelectric performance." @default.
- W3160494927 created "2021-05-24" @default.
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- W3160494927 date "2021-04-24" @default.
- W3160494927 modified "2023-10-15" @default.
- W3160494927 title "Substantial thermoelectric enhancement achieved by manipulating the band structure and dislocations in Ag and La co-doped SnTe" @default.
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- W3160494927 doi "https://doi.org/10.1007/s40145-021-0480-3" @default.
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