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Title: Electronic tuning of the transport properties of off-stoichiometric Pb{sub x}Sn{sub 1−x}Te thermoelectric alloys by Bi{sub 2}Te{sub 3} doping

The recent energy demands affected by the dilution of conventional energy resources and the growing awareness of environmental considerations had motivated many researchers to seek for novel renewable energy conversion methods. Thermoelectric direct conversion of thermal into electrical energies is such a method, in which common compositions include IV-VI semiconducting compounds (e.g., PbTe and SnTe) and their alloys. For approaching practical thermoelectric devices, the current research is focused on electronic optimization of off-stoichiometric p-type Pb{sub x}Sn{sub 1−x}Te alloys by tuning of Bi{sub 2}Te{sub 3} doping and/or SnTe alloying levels, while avoiding the less mechanically favorable Na dopant. It was shown that upon such doping/alloying, higher ZTs, compared to those of previously reported undoped Pb{sub 0.5}Sn{sub 0.5}Te alloy, were obtained at temperatures lower than 210–340 °C, depending of the exact doping/alloying level. It was demonstrated that upon optimal grading of the carrier concentration, a maximal thermoelectric efficiency enhancement of ∼38%, compared to that of an undoped material, is expected.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. The Unit of Energy Engineering, Ben-Gurion University of the Negev, Beer-Sheva (Israel)
  2. Department of Materials Engineering, Ben-Gurion University of the Negev, Beer-Sheva (Israel)
  3. (Israel)
Publication Date:
OSTI Identifier:
22499252
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 6; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 30 DIRECT ENERGY CONVERSION; BISMUTH TELLURIDES; CRYSTAL DOPING; DILUTION; DOPED MATERIALS; EFFICIENCY; ENERGY CONVERSION; ENERGY DEMAND; LEAD ALLOYS; LEAD TELLURIDES; OPTIMIZATION; RENEWABLE ENERGY SOURCES; SEMICONDUCTOR MATERIALS; STOICHIOMETRY; THERMOELECTRIC MATERIALS; TIN ALLOYS; TIN TELLURIDES