期刊
RESULTS IN PHYSICS
卷 19, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.rinp.2020.103584
关键词
Bismuth oxybromide; Electronic properties; Dynamical and thermal stability; Electrical and thermal transports; Figure of merit
资金
- Olle Engkvists stiftelse [198-0390]
- Carl Tryggers Stiftelse for Vetenskaplig Forskning [CTS: 18:4]
- Swedish Research Council [VR-2016-06014]
- Knut and Alice Wallenberg Foundation
- Kempe Foundations
- Lansstyrelsen Norrbotten
- Interreg Nord
- VR
Recently, the bismuth oxybromide quintuple-layer (QL) was experimentally realized. In the present study, we extensively examine the stability, electronic and thermal transport of bulk bismuth oxybromide (BiOBr) and QL based on first-principles calculations and the semiclassical Boltzmann transport theory. We have found that the bulk and QL BiOBr systems are dynamically and thermally stable with an indirect band gap of 2.86 and 3.08 eV, respectively. The emergence of comparatively flat bands at the top valence band favours the pronounced p-type Seebeck coefficient. Our calculated results demonstrate a high Seebeck coefficient of 1569.82 mu V/K and 1580 kilf/K for bulk and QL BiOBr materials at high temperatures. At higher temperature, the lattice thermal conductivity values of bulk are 1.32/0.23 for in-plane/out-of-plane, respectively and 1.85 W/mK in QL BiOBr, which are relatively low compared to other layered materials, e.g., MX2 (M = Mo, W, Pt, Zr, and X = S, Se, Te). The figure of merit (ZT) turns out to be as high as 3.52 for bulk BiOBr and 1.5 for QL BiOBr at higher temperatures, suggest them as good candidates for thermoelectric applications.
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