Park, Kyung Tae Cho, Young Shik Jeong, Inho Jang, Doojoon Cho, Hyeon Choi, Yoohyeon Lee, Taemin Ko, Youngpyo Choi, Jae yoo Hong, Soo Young Oh, Min-Wook Chung, Seungjun Park, Chong Rae Kim, Heesuk 2024-01-19T11:34:19Z 2024-01-19T11:34:19Z 2022-05-24 2022-07 1614-6832 https://pubs.kist.re.kr/handle/201004/114925 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. English Wiley-VCH Verlag Highly Integrated, Wearable Carbon-Nanotube-Yarn-Based Thermoelectric Generators Achieved by Selective Inkjet-Printed Chemical Doping Article 10.1002/aenm.202200256 1 Advanced Energy Materials, v.12, no.25 Advanced Energy Materials 12 25 N scie scopus 000789160500001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Energy & Fuels Materials Science Physics Article ULTRAHIGH-POWER-FACTOR ELECTRICAL-CONDUCTIVITY PERFORMANCE OVERCOME DESIGN carbon nanotubes high integration inkjet-printing thermoelectrics wearable electronics