期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 121, 期 1, 页码 123-128出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.6b10163
关键词
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资金
- U.S. Army Research Office MURI [W911NF-11-1-0362]
- Laboratory Directed Research and Development Program [065K1601]
- National Natural Science Foundation of China [11474273]
Current thermoelectric (TE) materials often have low performance or contain less abundant and/or toxic elements, thus limiting-their large-scale applications. Therefore, new TE materials with high efficiency and low cost are strongly desirable. Here:We demonstrate that SiS and SiSe monolayers made from nontoxic and earth-abundant elements intrinsically have low thermal conductivities arising from their low frequency optical phonon branches with large overlaps with acoustic phonon modes, which is similar to the state-of-the-art experimentally demonstrated material SnSe with a layered. structure. Together with high thermal power factors due to their two-dimensional nature, they show promising TE performances with large figure of merit (ZT) values exceeding 1 or 2 over a wide range of temperatures. We establish some basic understanding of identifying layered materials with low thermal conductivities, which can guide and stimulate the search and study of other layered materials for TE applications.
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