Journal
ORGANIC ELECTRONICS
Volume 90, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2020.106056
Keywords
Room-temperature thermoelectric; P3HT; CNT yarn; F4TCNQ doped; Conducting polymer composite
Funding
- JSPS KAKENHI [17K20065, 18H01708]
- Shenzhen Science and Technology Innovation Commission (Basic Research Project) [JCYJ20180305180645221]
- Highlevel University Fund [G02236004]
- Shenzhen Peacock Team Project [KQTD2016030111203005]
- Grants-in-Aid for Scientific Research [18H01708, 17K20065] Funding Source: KAKEN
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The room-temperature thermoelectric performance of carbon nanotube yarn is improved through controlled doping with poly 3-hexylthiophene to enhance the power factor, offering potential for low-grade waste heat power generation.
High room-temperature thermoelectric performance is important for low-grade waste heat power generation as there are plenty of heat thrown away uselessly in our daily life, most of which are below 100 degrees C. However, most of the thermoelectric materials are limited to high temperature application. In this work, room-temperature thermoelectric power factor of carbon nanotube (CNT) yarn is improved by controlled doping, which is achieved by making composite with poly 3-hexylthiophene -2, 5-diyl (P3HT) followed by doping with 2, 3, 5, 6-tetrafluo-7, 7, 8, 8-tetracyanoquinodimethane (F4TCNQ). The temperature-dependent Seebeck coefficient based on power-law model suggests that P3HT shifts the Fermi energy of CNT yarn towards the valence band edge, and reduces the ionic scattering and carrier relaxation time. As a result, the Seebeck coefficient is increased while the variation of Seebeck coefficient with temperature is reduced, and hence, the room-temperature thermoelectric power factor is improved. With controlled doping, the power factor of CNT yarn/P3HT composite reaches to 1640-2160 mu W m(-1)K(-2) at the temperature range of 25-100 degrees C, which is higher than that of CNT yarn alone.
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