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First-principles investigation of the significant anisotropy and ultrahigh thermoelectric efficiency of a novel two-dimensional Ga₂I₂S₂ at room temperature

Chang, Zheng ; Liu, Ke ; Sun, Zhehao ; Yuan, Kunpeng ; Cheng, Shuwen ; Gao, Yufei ; Zhang, Xiaoliang ; Shen, Chen ; Zhang, Hongbin ; Wang, Ning ; Tang, Dawei (2022):
First-principles investigation of the significant anisotropy and ultrahigh thermoelectric efficiency of a novel two-dimensional Ga₂I₂S₂ at room temperature. (Publisher's Version)
In: International Journal of Extreme Manufacturing, 4 (2), IOP Publishing, e-ISSN 2631-7990,
DOI: 10.26083/tuprints-00021121,
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Item Type: Article
Origin: Secondary publication DeepGreen
Status: Publisher's Version
Title: First-principles investigation of the significant anisotropy and ultrahigh thermoelectric efficiency of a novel two-dimensional Ga₂I₂S₂ at room temperature
Language: English
Abstract:

Two-dimensional (2D) thermoelectric (TE) materials have been widely developed; however, some 2D materials exhibit isotropic phonon, electron transport properties, and poor TE performance, which limit their application scope. Thus, exploring excellent anisotropic and ultrahigh-performance TE materials are very warranted. Herein, we first investigate the phonon thermal and TE properties of a novel 2D-connectivity ternary compound named Ga₂I₂S₂ . This paper comprehensively studies the phonon dispersion, phonon anharmonicity, lattice thermal conductivity, electronic structure, carrier mobility, Seebeck coefficient, electrical conductivity, and the dimensionless figure of merit (ZT) versus carrier concentration for 2D Ga₂I₂S₂ . We conclude that the in-plane lattice thermal conductivities of Ga₂I₂S₂ at room temperature (300 K) are found to be 1.55 W mK⁻¹ in the X-axis direction (xx-direction) and 3.82 W mK⁻¹ in the Y-axis direction (yy-direction), which means its anisotropy ratio reaches 1.46. Simultaneously, the TE performance of p-type and n-type doping 2D Ga₂I₂S₂ also shows significant anisotropy, giving rise to the ZT peak values of p-type doping in xx- and yy-directions being 0.81 and 1.99, respectively, and those of n-type doping reach ultrahigh values of 7.12 and 2.89 at 300 K, which are obviously higher than the reported values for p-type and n-type doping ternary compound Sn₂BiX (ZT∼ 1.70 and ∼2.45 at 300 K) (2020 Nano Energy 67 104283). This work demonstrates that 2D Ga₂I₂S₂ has high anisotropic TE conversion efficiency and can also be used as a new potential room-temperature TE material.

Journal or Publication Title: International Journal of Extreme Manufacturing
Volume of the journal: 4
Issue Number: 2
Place of Publication: Darmstadt
Publisher: IOP Publishing
Collation: 13 Seiten
Uncontrolled Keywords: thermoelectricity, strong anisotropy, two-dimensional materials, room temperature, first-principles calculation
Classification DDC: 500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Material Science
Date Deposited: 13 Jul 2022 12:46
Last Modified: 06 Sep 2022 09:43
DOI: 10.26083/tuprints-00021121
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-211212
SWORD Depositor: Deep Green
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/21121
PPN: 498911055
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