The Electronic Transport Channel Protection and Tuning in Real Space to Boost the Thermoelectric Performance of Mg3+δ Sb2-y Bi y near Room Temperature.

ABSTRACT: The optimization of thermoelectric materials involves the decoupling of the transport of electrons and phonons. In this work, an increased Mg1-Mg2 distance, together with the carrier conduction network protection, has been shown as an effective strategy to increase the weighted mobility (U = μm ∗3/2) and hence thermoelectric power factor of Mg3+δ Sb2-y Bi y family near room temperature. Mg3+δ Sb0.5Bi1.5 has a high carrier mobility of 247 cm2 V-1 s-1 and a record power factor of 3470 μW m-1 K-2 at room temperature. Considering both efficiency and power density, Mg3+δ Sb1.0Bi1.0 with a high average ZT of 1.13 and an average power factor of 3184 μW m-1 K-2 in the temperature range of 50-250°C would be a strong candidate to replace the conventional n-type thermoelectric material Bi2Te2.7Se0.3.

SUBMITTER: Han Z 

PROVIDER: S-EPMC7064820 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature