Engineering Interfacial Effects in Electron and Phonon Transport of Sb 2 Te 3 /MoS 2 Multilayer for Thermoelectric ZT Above 2.0

Ahmad, Mujeeb and Agarwal, Khushboo and Munoz, Sergio Gonzalez and Ghosh, Abhishek and Kodan, Nisha and Kolosov, Oleg Victor and Mehta, Bodh Raj (2022) Engineering Interfacial Effects in Electron and Phonon Transport of Sb 2 Te 3 /MoS 2 Multilayer for Thermoelectric ZT Above 2.0. Advanced Functional Materials. ISSN 1616-301X

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Abstract

Efficient thermoelectric (TE) conversion of waste heat to usable energy is a holy grail promising to address major societal issues related to energy crisis and global heat management. For these to be economical, synthesis of a solid-state material with a high figure-of-merit (ZT) values is the key, with characterization methods quantifying TE and heat transport properties being indispensable for guiding the development of such materials. In the present study, a large enhancement of the TE power factor in Sb 2Te 3/MoS 2 multilayer structures is reported. A new approach is used to simultaneously experimentally determine the values of in-plane (k xy) and out-of-pane (k z) thermal conductivities for multilayer samples with characteristic layer thickness of few nanometres, essential for the quantification of the ZT, the key parameter for the TE material. Combining simultaneous enhancement in the value of in-plane power factor (to (4.9 ± 0.4) × mWm −1 K −2) and reduction of the in-plane value of the thermal conductivity (to 0.7 ± 0.1 Wm −1 K −1) for Sb 2Te 3/MoS 2 multilayer sample led to high values of ZT of 2.08 ± 0.37 at room temperature. The present study, therefore, sets the foundation for a new methodology of exploiting the properties of 2D/3D interfaces for the development of novel fully viable thermoelectric materials.

Item Type:
Journal Article
Journal or Publication Title:
Advanced Functional Materials
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3104
Subjects:
ID Code:
177097
Deposited By:
Deposited On:
10 Oct 2022 11:15
Refereed?:
Yes
Published?:
Published
Last Modified:
22 Nov 2022 11:55