Ag doping induced abnormal lattice thermal conductivity in Cu2Se

Liu, Weidi and Shi, Xiaolei and Hong, Min and Yang, Lei and Moshwan, Raza and Chen, Zhi-Gang and Zou, Jin (2018) Ag doping induced abnormal lattice thermal conductivity in Cu2Se. Journal of Materials Chemistry C, 6 (48). pp. 13225-13231. ISSN 2050-7526


Superionic Cu2Se-based thermoelectric materials have attracted extensive attention in recent years due to their ultralow lattice thermal conductivity and high dimensionless figure of merit (zT). Inspired by the effectiveness of heavy-element doping in reducing lattice thermal conductivity in various thermoelectric materials, we investigate the Ag-doping effects on the thermoelectric properties of Cu2Se nanocrystals made via a facile solvothermal method and subsequently spark plasma sintering. Based on the single parabolic band model analysis of thermoelectric properties, it has been found that the isoelectronic Ag dopant leads to an enhanced carrier concentration and significantly reduced carrier mobility, as well as a reduced electrical conductivity and power factor. Moreover, the reduced disorder-level of cations leads to an extraordinarily enhanced lattice thermal conductivity. All these result in a zT reduction for Ag-doped Cu2Se. This work systematically studies the influence of Ag dopants on the thermoelectric performance of Cu2Se and indicates that the Ag-doping is less promising in enhancing it.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - No Department
Date Deposited: 21 Feb 2019 02:50
Last Modified: 04 Mar 2019 04:22
Uncontrolled Keywords: high thermoelectric performance; figure; merit; imperfections; behavior; vacancy; SnSe
Fields of Research : 03 Chemical Sciences > 0302 Inorganic Chemistry > 030206 Solid State Chemistry
10 Technology > 1007 Nanotechnology > 100708 Nanomaterials
09 Engineering > 0912 Materials Engineering > 091205 Functional Materials
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970103 Expanding Knowledge in the Chemical Sciences
Identification Number or DOI: 10.1039/c8tc04129f

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