Work

Origins of promising thermoelectric performance in quaternary selenide BaAg2SnSe4

Year: 2019

Type: article

Abstract: Motivated by the recent discovery of low thermal conductivity in 1-2-1-4 quaternary selenides, we studied the origins of promising thermoeletric performance of BaAg 2 SnSe 4 using ab initio calculations. We have shown that BaAg 2 SnSe 4 is a model material of valley degeneracy, either conduction valleys or valence valleys are highly degenerate, yielding promising electronic transport performance. Meanwhile, the extremely low thermal conductivity arises primarily from lattice contribution. Due to both advantages of electronic and phonon transport properties, the calculated thermoelectric figure of merit ZT exceeds 1 at room temperature. Our results highlight the advantages of quaternary BaAg 2 SnSe 4 as a promising bulk thermoelectric material.

Source: Applied Physics Express

DOI: 10.7567/1882-0786/ab29e1

Authors: Guangqian Ding, Shuo Li, Junjie He

Institutions: Chongqing University of Posts and Telecommunications, Charles University, Chengdu University

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: bronze

Funders: National Natural Science Foundation of China, Fundamental Research Funds for the Central Universities

Awards: G6751295844, G8529421181