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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Engineering Interfacial Effects in Electron and Phonon Transport of Sb 2 Te 3 /MoS 2 Multilayer for Thermoelectric ZT Above 2.0
AU - Ahmad, Mujeeb
AU - Agarwal, Khushboo
AU - Munoz, Sergio Gonzalez
AU - Ghosh, Abhishek
AU - Kodan, Nisha
AU - Kolosov, Oleg Victor
AU - Mehta, Bodh Raj
PY - 2022/12/2
Y1 - 2022/12/2
N2 - 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.
AB - 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.
KW - Research Article
KW - Research Articles
KW - 2D/3D interfaces
KW - energy filtering effect
KW - phonon scattering
KW - thermal transports
KW - thermoelectric properties
KW - wedge cuts
KW - xSThM
U2 - 10.1002/adfm.202206384
DO - 10.1002/adfm.202206384
M3 - Journal article
VL - 32
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 49
M1 - 2206384
ER -