期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 146, 期 1-2, 页码 153-158出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2014.03.014
关键词
Thin films; Sputtering; Thermoelectric effects; Transport properties
资金
- Science and Technology Development Fund Planning Project for the Universities of Tianjin [20130304]
- State Key Development Program for Basic Research of China [2012CB933200]
- National Natural Science Foundation of China [51172008, 51002006]
- National Natural Science Fund Innovation Group [50921003]
- Research Fund for Doctor Station Sponsored by the Ministry of Education of China [20111102110035]
- Scientific Research Fund Project of Tianjin University of Science and Technology, China [20130121]
In this paper, it was found that layered and columnar structure can favorably influence the carrier and phonon transport properties of films. The n-Bi2Te2.7Se0.3 columnar film with layered structure was successfully achieved by simple magnetron co-sputtering method at 400 degrees C deposition temperature, due to the more sufficient growth along the in-plane direction induced by the enhanced mobility of deposited atoms. The layered nanostructure is clear with each layer <25 nm in the columnar film. The properties of the Bi2Te2.7Se0.3 columnar film with layered structure were greatly enhanced in comparison with those of the columnar and the ordinary films synthesized respectively at 350 degrees C and 250 degrees C deposition temperature. The layered Bi2Te2.7Se0.3 columnar film with a thermoelectric dimensionless figure-of-merit ZT = 1.27 was obtained at room temperature. The layered column structure was the main reason for the properties enhancement observed in the Bi2Te2.7Se0.3 film. Introduction of such uniquely layered and columnar structure into thermoelectric films is therefore a very promising approach. (C) 2014 Elsevier B.V. All rights reserved.
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