期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 688, 期 -, 页码 521-526出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.07.218
关键词
Semiconductors; X-ray diffraction; Electronic transport
资金
- National Natural Science Foundation of China [51101103, 51571144]
- Shenzhen Science and Technology Research Grant [JCYJ201508 27155136104, JCYJ20150324141711684, JCYJ20140418181958489, JCYJ20140418182819176]
(Cu2Se)(1-x)(CuGaSe2)(x) alloys with x = 0, 0.005, 0.0075, 0.01, 0.015, 0.025 and 0.03 were prepared by melting and ball milling, followed by spark plasma sintering. The X-ray powder diffraction analysis results indicated that there was a very low amount of CuGaSe2 in a solid solution of crystalline beta-Cu2Se. However, a small amount of dissolved Ga atoms significantly decreased the electrical resistivity and thermal conductivity and drastically decreased the lattice thermal conductivity of b-Cu2Se, thereby improving the power factor and the figure of merit of the system. When the second phase of CuGaSe2 was present, its high electrical resistivity and thermal conductivity had an opposing effect, which lowered the thermoelectric performance of the system. A high figure of merit (zT) of 1.4 was obtained for the (Cu2Se)(0.9925)(CuGaSe2)(0.0075) samples at 823 K. (C) 2016 Elsevier B.V. All rights reserved.
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