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Title: Enhanced power factor and high-pressure effects in (Bi,Sb){sub 2}(Te,Se){sub 3} thermoelectrics

We investigated the effects of applied high pressure on thermoelectric, electric, structural, and optical properties of single-crystalline thermoelectrics, Bi{sub 2}Te{sub 3}, Bi{sub x}Sb{sub 2−x}Te{sub 3} (x = 0.4, 0.5, 0.6), and Bi{sub 2}Te{sub 2.73}Se{sub 0.27} with the high thermoelectric performance. We established that moderate pressure of about 2–4 GPa can greatly enhance the thermoelectric power factor of all of them. X-ray diffraction and Raman studies on Bi{sub 2}Te{sub 3} and Bi{sub 0.5}Sb{sub 1.5}Te{sub 3} found anomalies at similar pressures, indicating a link between crystal structure deformation and physical properties. We speculate about possible mechanisms of the power factor enhancement and suppose that pressure/stress tuning can be an effective tool for the optimization of the thermoelectric performance.
Authors:
 [1] ;  [2] ; ; ; ;  [3] ; ; ;  [4] ;  [5] ;  [6] ;  [7] ;  [2] ;  [8] ;  [9] ;  [10]
  1. Bayerisches Geoinstitut, Universität Bayreuth, Universitätsstrasse 30, D-95447 Bayreuth (Germany)
  2. (Russian Federation)
  3. M. N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 18 S. Kovalevskaya Str., Yekaterinburg 620137 (Russian Federation)
  4. Ioffe Institute, St Petersburg 194021 (Russian Federation)
  5. A. V. Nikolaev Institute of Inorganic Chemistry of Russian Academy of Sciences, Siberian Division, Novosibirsk 630090 (Russian Federation)
  6. Institute of Mineralogy and Petrography of Russian Academy of Sciences, Siberian Division, Novosibirsk 630090 (Russian Federation)
  7. Budker Institute of Nuclear Physics of Russian Academy of Sciences, Siberian Division, 630090 Novosibirsk (Russian Federation)
  8. Institute for Solid State Chemistry of Ural Branch of Russian Academy of Sciences, Yekaterinburg 620219 (Russian Federation)
  9. M. V. Lomonosov Moscow State University, Physics Department, 119991 GSP1, Moscow (Russian Federation)
  10. Institute for Solid State Physics, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8581 Chiba (Japan)
Publication Date:
OSTI Identifier:
22398875
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIMONY SELENIDES; BISMUTH TELLURIDES; CRYSTAL STRUCTURE; DEFORMATION; MONOCRYSTALS; OPTICAL PROPERTIES; OPTIMIZATION; PERFORMANCE; POWER FACTOR; PRESSURE DEPENDENCE; PRESSURE RANGE GIGA PA; STRESSES; THERMOELECTRIC MATERIALS; THERMOELECTRIC PROPERTIES; X-RAY DIFFRACTION