In:
Chinese Physics B, IOP Publishing, Vol. 32, No. 10 ( 2023-09-01), p. 107304-
Kurzfassung:
The thermoelectric properties of layered Mo 2 AB 2 ( A = S, Se, Te; B = Cl, Br, I) materials are systematically investigated by first-principles approach. Soft transverse acoustic modes and direct Mo d–Mo d couplings give rise to strong anharmonicities and low lattice thermal conductivities. The double anions with distinctly different electronegativities of Mo 2 AB 2 monolayers can reduce the correlation between electron transport and phonon scattering, and further benefit much to their good thermoelectric properties. Thermoelectric properties of these Mo 2 AB 2 monolayers exhibit obvious anisotropies due to the direction-dependent chemical bondings and transport properties. Furthermore, their thermoelectric properties strongly depend on carrier type (n-type or p-type), carrier concentration and temperature. It is found that n-type Mo 2 AB 2 monolayers can be excellent thermoelectric materials with high electric conductivity, σ , and figures of merit, ZT . Choosing the types of A and B anions of Mo 2 AB 2 is an effective strategy to optimize their thermoelectric performance. These results provide rigorous understanding on thermoelectric properties of double-anions compounds and important guidance for achieving high thermoelectric performance in multi-anion compounds.
Materialart:
Online-Ressource
ISSN:
1674-1056
,
2058-3834
DOI:
10.1088/1674-1056/ace314
Sprache:
Unbekannt
Verlag:
IOP Publishing
Publikationsdatum:
2023
ZDB Id:
2412147-2
