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Comparison of the electronic and thermoelectric properties of three layered phases Bi2Te3, PbBi2Te4 and PbBi4Te7: LEGO thermoelectrics

Journal Article · · AIP Advances
DOI:https://doi.org/10.1063/1.5047823· OSTI ID:1543882
 [1];  [2];  [3];  [3];  [1];  [4];  [5]
  1. Pohang Univ. of Science and Technology, Pohang (South Korea). Dept. of Chemistry, and Division of Advanced Nuclear Engineering
  2. Pohang Univ. of Science and Technology, Pohang (South Korea). Dept. of Chemistry
  3. Sungkyunkwan Univ., Suwon (South Korea). School of Advanced Materials Science and Engineering
  4. Pukyong National Univ., Busan (South Korea). Dept. of Materials System Engineering
  5. Univ. of North Carolina, Chapel Hill, NC (United States). Dept. of Chemistry
The electronic and thermoelectric properties of Bi2Te3, PbBi2Te4 and PbBi4Te7 were examined on the basis of density functional theory (DFT) calculations and thermoelectric transport property measurements. The layered phase PbBi4Te7 is composed of the slabs forming the layered phases Bi2Te3and PbBi2Te4. The electronic structure of PbBi4Te7 around the valence band maximum and conduction band minimum exhibits those of Bi2Te3 and PbBi2Te4. The band gap of PbBi4Te7 lies in between those of Bi2Te3and PbBi2Te4, and the density of states of PbBi4Te7 is well approximated by the sum of those of Bi2Te3 and PbBi2Te4. In terms of the carrier concentration, the carrier mobility, the carrier lifetime, the electrical conductivity normalized to the carrier lifetime, and the effective mass, the layered phases Bi2Te3, PbBi2Te4 and PbBi4Te7 form a group of thermoelectrics, which have the structures composed of several different slabs and whose thermoelectric properties are approximated by the average of those of the constituent slabs. We propose to use the term “LEGO thermoelectrics” to describe such a family of thermoelectric materials that operate in a desired temperature range and possess predictable thermoelectric properties.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1543882
Journal Information:
AIP Advances, Journal Name: AIP Advances Journal Issue: 11 Vol. 8; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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