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Title: Thermoelectric transport in surface- and antimony-doped bismuth telluride nanoplates

We report the in-plane thermoelectric properties of suspended (Bi1–xSbx)2Te3 nanoplates with x ranging from 0.07 to 0.95 and thicknesses ranging from 9 to 42 nm. The results presented here reveal a trend of increasing p-type behavior with increasing antimony concentration, and a maximum Seebeck coefficient and thermoelectric figure of merit at x ~ 0.5. We additionally tuned extrinsic doping of the surface using a tetrafluoro-tetracyanoquinodimethane (F4-TCNQ) coating. As a result, the lattice thermal conductivity is found to be below that for undoped ultrathin Bi2Te3 nanoplates of comparable thickness and in the range of 0.2–0.7 W m–1 K–1 at room temperature.
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ; ORCiD logo [2]
  1. The Univ. of Texas at Austin, Austin, TX (United States); Univ. of Connecticut, Storrs, CT (United States)
  2. The Univ. of Texas at Austin, Austin, TX (United States)
  3. Univ. of Connecticut, Storrs, CT (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
OSTI Identifier:
1272641
Grant/Contract Number:
AC02-05CH11231
Type:
Published Article
Journal Name:
APL Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 10; Journal ID: ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Connecticut, Storrs, CT (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION; antimony; doping; thermoelectric effects; thermal conductivity; surface conductivity