Thermoelectric Properties of Cu-doped Bi2−xSbxTe3 Prepared by Encapsulated Melting and Hot Pressing

다국어 초록 (Multilingual Abstract)

P-type Bi2−xSbxTe3:Cum (x = 1.5–1.7 and m = 0.002–0.003) solid solutions were synthesized using encapsulated meltingand were consolidated using hot pressing. The effects of Sb substitution and Cu doping on the charge transport and thermoelectricproperties were examined. The lattice constants decreased with increasing Sb and Cu contents. As the amount ofSb substitution and Cu doping was increased, the electrical conductivity increased, and the Seebeck coefficient decreasedowing to the increase in the carrier concentration. All specimens exhibited degenerate semiconductor characteristics andpositive Hall and Seebeck coefficients, indicating p-type conduction. The increased Sb substitution caused a shift in the onsettemperature of the intrinsic transition and bipolar conduction to higher temperatures. The electronic thermal conductivityincreased with increasing Sb and Cu contents owing to the increase in the carrier concentration, while the lattice thermalconductivity slightly decreased due to alloy scattering. A maximum figure of merit, ZTmax= 1.25, was achieved at 373 Kfor Bi0.4Sb1.6Te3:Cu0.003.

참고문헌 (Reference)

1 S.K. Bux, 46 : 8311-, 2010

2 T.A. McCarthy, 3 : 697-, 1970

3 H. Cailat, 80 : 4442-, 1996

4 L. Hu, 22 : 16484-, 2012

5 H.J. Goldsmid, 32 : 2198-, 1961

6 L.V. Prokof’eva, 43 : 1155-, 2009

7 D. Vasilevskiy, 92 : 2610-, 2002

8 S.Y. Wang, 19 : 1024-, 2011

9 G.R. Miller, 26 : 173-, 1965

10 J. Horak, 47 : 805-, 1986

11 Z. Stary, 49 : 29-, 1988

12 A. Hashibon, 84 : 144117-, 2011

13 S. Chen, 43 : 1966-, 2014

14 R.O. Carlson, 13 : 65-, 1960

15 H.S. Kim, 3 : 041506-, 2015

16 W.S. Liu, 1 : 577-, 2011

17 M.K. Han, 21 : 11365-, 2011

18 J.L. Cui, 180 : 3583-, 2007

19 H. Li, 576 : 369-, 2013

20 Y.S. Lim, 687 : 320-, 2016

21 Z. Huang, 118 : 19-, 2016

22 J.H. Son, 566 : 168-, 2013

23 G.J. Snyder, 7 : 105-, 2008

24 H. Kohler, 74 : 591-, 1976

25 H.T. Langhammer, 123 : K47-, 1984

26 H.J. Goldsmid, "Thermoelectric Refrigeration" Plenum 43-, 1964

27 Woo-Jin Jung, "Mechanical and Thermoelectric Properties of Bi2−xSbxTe3 Prepared by Using Encapsulated Melting and Hot Pressing" 한국물리학회 69 (69): 1328-1334, 2016

28 H. Scherrer, "Handbook of Thermoelectrics, chap. 19" CRC Press 1995