Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 8, Issue 14, Pages 4827-4835Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc00611d
Keywords
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Funding
- National Natural Science Foundation of China [51603124, 51773118]
- Natural Science Foundation of Guangdong Province [2019A1515012179]
- Shenzhen Sci & Tech Research Grant [JCYJ20180305124832322, ZDSYS201507141105130]
- Science Foundation of Shenzhen University [827-000148]
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Carbon-based materials have ascended as promising candidates for thermoelectric energy conversion. This study demonstrated charge transfer complexes (CTCs) as novel p-dopants for single-walled carbon nanotubes (SWCNTs), which established reduced correlations between electrical conductivity and Seebeck coefficient compared with those of traditional p-dopants. The SWCNT films doped with 0.07 wt% CTCs of tetrathiafulvalene-7,7,8,8-tetracyanoquinodimethane (TTF-TCNQ) exhibited a maximum power factor of 248 mu W m(-1) K-2 at room temperature, which was 51% higher than that of the undoped SWCNTs and 20% higher than that of the TCNQ-doped SWCNT films. Flexible thermoelectric generators solely from TTF-TCNQ-doped SWCNT films exhibited a maximum output power of 17.4 nW under a temperature bias of Delta T = 22.8 K from a device with 12 active modules, while the device composed of TCNQ-doped SWCNT films did not produce recordable output power. The more efficient thermoelectric conversion capability for the CTC-doped SWCNT could be explained by its lower amount of structural defects, higher carrier mobility and reduced charge transfer process between SWCNT and dopant molecules. This work demonstrated that charge transfer complexes were more superior p-dopants, which were generally applicable for SWCNT-based thermoelectric materials and generators.
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