期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 25, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202200256
关键词
carbon nanotubes; high integration; inkjet-printing; thermoelectrics; wearable electronics
类别
资金
- Korea Institute of Science and Technology (KIST) Future Resource Research Program [2E31161]
- National Research Foundation of Korea [NRF-2019R1A2C2091094]
- Creative Materials Discovery Program through the NRF - Ministry of Science and ICT [2020M3D1A1110499]
- Korea Initiative for fostering the University of Research and Innovation Program of NRF [2020M3H1A107720713]
- National Research Foundation of Korea [2020M3D1A1110499] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Flexible thermoelectric materials are essential for self-powered wearable electronics, but their practical applications are hindered by low performance. This study proposes a highly aligned carbon-nanotube yarns (CNTYs) with selective doping via inkjet printing, achieving ultrahigh power factors for p- and n-type thermoelectric materials. The highly integrated, flexible CNTY-based thermoelectric generator (TEG) can generate unprecedented milliwatt-scale power using body heat alone, surpassing previously reported flexible material-based TEGs.
Flexible thermoelectrics that enable conformal contact with heat sources of arbitrary shape are indispensable for self-powered wearable electronics. Scalable integration of flexible thermoelectric (TE) materials into functional devices has improved over the past few years, however, the practical applications of flexible TE materials are still hindered by low performance. Herein, highly aligned carbon-nanotube yarns (CNTYs) are proposed, combined with selective doping via picoliter scale inkjet printing. Coagulation assisted by van der Waals forces ensures a highly aligned structure of the CNTY, thus achieving the ultrahigh power factors of 4091 and 4739 mu W m(-1) K-2 for the p- and n-type, respectively. The proposed TE materials can be effortlessly up-scaled into highly integrated modules via inkjet printing. A highly integrated, flexible CNTY-based TE generator (TEG) with 600 PN pairs generates unparalleled milliwatt-scale power at Delta T = 25 K, which is a few orders of magnitude higher than those of previously reported flexible material-based TEGs. This TEG successfully powers a red light-emitting diode using body heat alone, requiring no external power sources. For the seamless operation of practical applications requiring high power, this work explores the key design parameters for flexible TEGs with high performance and manufacturability and presents new platforms for self-powered wearable electronics.
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