TY - JOUR
T1 - Improved room-temperature thermoelectric characteristics in F4TCNQ-doped CNT yarn/P3HT composite by controlled doping
AU - Myint, May Thu Zar
AU - Nishikawa, Takeshi
AU - Inoue, Hirotaka
AU - Omoto, Kazuki
AU - Kyaw, Aung Ko Ko
AU - Hayashi, Yasuhiko
N1 - Funding Information:
This work was partially supported by JSPS KAKENHI (Grants Numbers 17K20065 and 18H01708 ). AKKK would like to thank financial support from Shenzhen Science and Technology Innovation Commission (Basic Research Project (No. JCYJ20180305180645221 ), High-level University Fund ( G02236004 ) and Shenzhen Peacock Team Project (No. KQTD2016030111203005 )).
PY - 2021/3
Y1 - 2021/3
N2 - 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 °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 μW m−1K−2 at the temperature range of 25–100 °C, which is higher than that of CNT yarn alone.
AB - 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 °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 μW m−1K−2 at the temperature range of 25–100 °C, which is higher than that of CNT yarn alone.
KW - CNT yarn
KW - Conducting polymer composite
KW - F4TCNQ doped
KW - P3HT
KW - Room-temperature thermoelectric
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U2 - 10.1016/j.orgel.2020.106056
DO - 10.1016/j.orgel.2020.106056
M3 - Article
AN - SCOPUS:85099522646
SN - 1566-1199
VL - 90
JO - Organic Electronics
JF - Organic Electronics
M1 - 106056
ER -