Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 43, Pages 24982-24991Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta09620e
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Funding
- National Natural Science Foundation of China [51603124, 51773118]
- Shenzhen Sci & Tech Research Grant [JCYJ20180305124832322, ZDSYS201507141105130]
- Science Foundation of Shenzhen University [827-000148]
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Herein, we demonstrated a new strategy of balancing the electrical conductivity and Seebeck coefficient for high-performance p-type organic thermoelectric composites of single-walled carbon nanotubes (SWCNTs) and 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8BTBT) by controlling the doping process. It was found that interfacial doping of the thermoelectric composite films with a vacuum-deposited organic acceptor, 7,7,8,8-tetracyanoquinodimethane (TCNQ), led to the formation of charge-transfer complex crystals at the interface, which resulted in higher carrier mobilities and moderate carrier concentrations compared with the solution-phase bulk doping method. The composite film of SWCNT/C8BTBT interfacial-doped with fine-tuned 40 nm-thick TCNQ exhibited a power factor as high as 284 mu W m(-1) K-2 at room temperature, which was five times higher than that of the bulk doped film for similar dopant addition. The high power factor of the interfacial-doped composite film was attributed to the less interruption to the lattice structure and controlled charge transfer processes among SWCNTs, C8BTBT and TCNQ. This strategy can be used as a general method for high-performance organic thermoelectric composites.
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