Yoon, Sang Eun Park, Jaehong Kwon, Ji Eon Lee, Sang Yeon Han, Ji Min Go, Chae Young Choi, Siku Kim, Ki Chul Seo, Hyungtak Kim, Jong H. Kim, Bong-Gi 2024-01-19T16:03:05Z 2024-01-19T16:03:05Z 2021-09-02 2020-12 0935-9648 https://pubs.kist.re.kr/handle/201004/117810 Doping capability is primitively governed by the energy level offset between the highest occupied molecular orbital (HOMO) of conjugated polymers (CPs) and the lowest unoccupied molecular orbital (LUMO) of dopants. A poor doping efficiency is obtained when doping directly using NOBF4 forming a large energy offset with the CP, while the devised doping strategy is found to significantly improve the doping efficiency (electrical conductivity) by sequentially treating the NOBF4 to the pre-doped CP with 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquino-dimethane (F4TCNQ), establishing a relatively small energy level offset. It is verified that the cascade doping strategy requires receptive sites for each dopant to further improve the doping efficiency, and provides fast reaction kinetics energetically. An outstanding electrical conductivity (>610 S cm(-1)) is achieved through the optimization of the devised doping strategy, and spectroscopy analysis, including Hall effect measurement, supports more efficient charge carrier generation via the devised cascade doping. English WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Improvement of Electrical Conductivity in Conjugated Polymers through Cascade Doping with Small-Molecular Dopants Article 10.1002/adma.202005129 1 Advanced Materials, v.32, no.49 Advanced Materials 32 49 N scie scopus 000583234600001 2-s2.0-85094635410 Chemistry, Multidisciplinary Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article ORGANIC SEMICONDUCTORS TRANSPORT doping efficiency doping mechanisms molecular dopants organic conductors doping