High thermoelectric performance realized through manipulating layered phonon-electron decoupling.
Science
; 375(6587): 1385-1389, 2022 03 25.
Article
en En
| MEDLINE
| ID: mdl-35324303
ABSTRACT
Thermoelectric materials allow for direct conversion between heat and electricity, offering the potential for power generation. The average dimensionless figure of merit ZTave determines device efficiency. N-type tin selenide crystals exhibit outstanding three-dimensional charge and two-dimensional phonon transport along the out-of-plane direction, contributing to a high maximum figure of merit Zmax of ~3.6 × 10-3 per kelvin but a moderate ZTave of ~1.1. We found an attractive high Zmax of ~4.1 × 10-3 per kelvin at 748 kelvin and a ZTave of ~1.7 at 300 to 773 kelvin in chlorine-doped and lead-alloyed tin selenide crystals by phonon-electron decoupling. The chlorine-induced low deformation potential improved the carrier mobility. The lead-induced mass and strain fluctuations reduced the lattice thermal conductivity. Phonon-electron decoupling plays a critical role to achieve high-performance thermoelectrics.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Science
Año:
2022
Tipo del documento:
Article
País de afiliación:
China