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Title: High-Performance Screen-Printed Thermoelectric Films on Fabrics

Printing techniques could offer a scalable approach to fabricate thermoelectric (TE) devices on flexible substrates for power generation used in wearable devices and personalized thermo-regulation. However, typical printing processes need a large concentration of binder additives, which often render a detrimental effect on electrical transport of the printed TE layers. Here, we report scalable screenprinting of TE layers on flexible fiber glass fabrics, by rationally optimizing the printing inks consisting of TE particles (p-type Bi 0.5Sb 1.5Te 3 or n-type Bi 2Te 2.7Se 0.3), binders, and organic solvents. We identified a suitable binder additive, methyl cellulose, which offers suitable viscosity for printability at a very small concentration (0.45–0.60 wt.%), thus minimizing its negative impact on electrical transport. Following printing, the binders were subsequently burnt off via sintering and hot pressing. We found that the nanoscale defects left behind after the binder burnt off became effective phonon scattering centers, leading to low lattice thermal conductivity in the printed n-type material. With the high electrical conductivity and low thermal conductivity, the screen-printed TE layers showed high room-temperature ZT values of 0.65 and 0.81 for p-type and n-type, respectively.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [2] ;  [2] ;  [5] ;  [2] ;  [5] ;  [5] ;  [6] ;  [1]
  1. Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program
  2. Univ. of California, San Diego, CA (United States). Dept. of NanoEngineering
  3. Samsung Advanced Inst. of Technology, Suwon-si, Gyeonggi-do (Korea)
  4. Univ. of Seoul (Korea). Dept. of Materials Science and Engineering
  5. Univ. of California, San Diego, CA (United States). Dept. of Mechanical and Aerospace Engineering
  6. Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program; Univ. of California, San Diego, CA (United States). Dept. of NanoEngineering
Publication Date:
Grant/Contract Number:
AR0000535; DGE-1144086
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Univ. of California, San Diego, CA (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; Devices for energy harvesting; Thermoelectric devices and materials
OSTI Identifier:
1424227