Improved Thermoelectric Performance of Tellurium by Alloying with a Small Concentration of Selenium to Decrease Lattice Thermal Conductivity.

Autor:	Saparamadu U; Department of Physics and Texas Center for Superconductivity , University of Houston , Houston , Texas 77204 , United States., Li C; Department of Physics , Boston College , Chestnut Hill , Massachusetts 02467 , United States., He R; Leibniz Institute for Solid State and Materials Research , IFW-Dresden, Helmholtzstr. 20 , 01069 Dresden , Germany., Zhu H; Department of Physics and Texas Center for Superconductivity , University of Houston , Houston , Texas 77204 , United States., Ren Z; Department of Physics and Texas Center for Superconductivity , University of Houston , Houston , Texas 77204 , United States., Mao J; Department of Physics and Texas Center for Superconductivity , University of Houston , Houston , Texas 77204 , United States.; Department of Mechanical Engineering , University of Houston , Houston , Texas 77204 , United States., Song S; Department of Physics and Texas Center for Superconductivity , University of Houston , Houston , Texas 77204 , United States.; Program of Material Science and Engineering , University of Houston , Houston , Texas 77204 , United States., Sun J; Department of Physics and Texas Center for Superconductivity , University of Houston , Houston , Texas 77204 , United States., Chen S; Department of Physics and Texas Center for Superconductivity , University of Houston , Houston , Texas 77204 , United States., Zhang Q; Key Laboratory of Fluid and Power Machinery of Ministry of Education & Center for Advanced Materials and Energy , Xihua University , Chengdu , Sichuan 610039 , China., Nielsch K; Leibniz Institute for Solid State and Materials Research , IFW-Dresden, Helmholtzstr. 20 , 01069 Dresden , Germany., Broido D; Department of Physics , Boston College , Chestnut Hill , Massachusetts 02467 , United States., Ren Z; Department of Physics and Texas Center for Superconductivity , University of Houston , Houston , Texas 77204 , United States.
Jazyk:	angličtina
Zdroj:	ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2019 Jan 09; Vol. 11 (1), pp. 511-516. Date of Electronic Publication: 2018 Dec 20.
DOI:	10.1021/acsami.8b13121
Abstrakt:	Phonon scattering through alloying is a highly effective way to reduce lattice thermal conductivity due to the mass difference between the host and alloyed atoms and strains caused by the different atoms. In this work we investigate the thermoelectric properties of Te between 323 and 623 K. By varying the alloying concentration of Se, a minimum lattice thermal conductivity was achieved with ∼10% (by stoichiometry) alloying of Te by Se. Additionally, Sb has been used as a dopant to increase the carrier concentration of the system. With reduced lattice thermal conductivity by Se alloying and increased carrier concentration by Sb doping, the room-temperature figure of merit ( ZT) increased by 60%, leading to an average ZT of ∼0.8 in Te 0.88 Se 0.10 Sb 0.02 , which corresponds to an engineering figure of merit ( ZT) eng ∼ 0.5 between 323 and 623 K and an efficiency of ∼8% in the same temperature range. The results indicate that the combination of Se alloying and Sb doping is successful in improving the thermoelectric properties of Te.
Databáze:	MEDLINE
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