Multifunctional GeMnTe2 Synergistically Optimizes Thermoelectric Properties of SnTe-In2Te3 Alloys

ACS APPLIED MATERIALS & INTERFACES(2023)

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摘要
SnTe-In2Te3 alloys ensure excellent electrical properties in the whole temperature region due to the resonant level. Nevertheless, temperature-sensitive resonance states and single phonon scattering restrict further improvement of thermoelectric performance. Consequently, it is anticipated that additional electrically independent scattering sources should be introduced to impede phonon transport. Here, the SnTe-In2Te3-GeMnTe2 alloy is prepared by further solidifying cubic GeMnTe2, which demonstrates multiple modulation effects. The highly redissolved Mn2+ promotes the valence band convergence, enhances the Seebeck coefficient at higher temperature, and balances the possible weakened resonance level effect at higher carrier concentrations, and a high average power factor (1.94 mW m(-1) K-2) is realized over the entire temperature range. Additionally, compensatory vacancies, substitutions, and Ge/Mn precipitates are easily constructed with GeMnTe2 alloying, leading to a further reduction in lattice thermal conductivity, which reaches kappa(l) similar to 0.6 W m(-1) K-1 at 850 K. Ultimately, a high peak zT of similar to 1.25 (850 K) and a zT(ave) of 0.72 (300-850 K) are realized in (SnTe)(2.91)(In2Te3)(0.03)(Ge0.5Mn0.5Te)(1.2), and the maximum thermoelectric conversion efficiency of similar to 2.8% (Delta T similar to 450 K) is achieved. The present results indicate multiple effects of GeMnTe2 in enhancing the thermoelectric performance of SnTe-In2Te3 alloys.
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关键词
thermoelectric,SnTe-In2Te3,GeMnTe2,multiple modulation,phononscattering
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