期刊
ADVANCED ELECTRONIC MATERIALS
卷 7, 期 12, 页码 -出版社
WILEY
DOI: 10.1002/aelm.202100557
关键词
charge transfer complex; doping; organic thermoelectric; single-walled carbon nanotubes
资金
- National Natural Science Foundation of China [51603124, 21701029]
- Natural Science Foundation of Guangdong Province [2019A1515012179]
- Shenzhen Sci & Tech Research Grant [JCYJ20180305124832322, ZDSYS201507141105130]
The study focuses on the composite of organic charge transfer complexes (CTCs) and single-walled carbon nanotubes (SWCNTs) as thermoelectric materials for flexible thermoelectric generators, where different side chains of BTBT derivatives and F(4)TCNQ are component of the CTCs. The highest p-type power factor is observed in PhBTBT-F(4)TCNQ/SWCNT composite film, while the highest n-type power factor is found in C8BTBT-F(4)TCNQ/SWCNT composite film.
Organic charge transfer complexes (CTCs) or electron donor-acceptor complexes have been intensively studied as organic semiconductors or organic conductors in organic electronics. Herein, the composite of CTCs and single-walled carbon nanotubes (SWCNTs) is studied as both p-type and n-type thermoelectric materials for flexible thermoelectric generators. CTCs are formed by [1]benzothieno[3,2-b][1]benzothiophene (BTBT) derivatives with different side chains as electron donors and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F(4)TCNQ) as electron acceptors. The thermoelectric properties of the composites as well as the effect of side chains in BTBT derivatives are investigated. It is found that the PhBTBT-F(4)TCNQ/SWCNT composite film shows the highest p-type power factor of 244.3 mu W m(-1) K-2; while the C8BTBT-F(4)TCNQ/SWCNT composite film exhibits the highest n-type power factor of 105.1 mu W m(-1) K-2. The thermoelectric module based on five p-n junctions of C8BTBT-F(4)TCNQ/SWCNT exhibits the highest output voltage of 13.1 mV and output power of 340 nW under a 38 K temperature gradient. This device performance is mainly generated from the moderate carrier concentrations and low film defects in the n-type C8BTBT-F(4)TCNQ/SWCNT composite film.
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