title: High-Performing Thin-Film Transistors in Large Spherulites of Conjugated Polymer Formed by Epitaxial Growth on Removable Organic Crystalline Templates.
abstract: Diketopyrrolopyrrole (DPP)-based conjugated polymer PDTDPPQT was synthesized and was used to perform epitaxial polymer crystal growth on removable 1,3,5-trichlorobenzene crystallite templates. A thin-film transistor (TFT) was successfully fabricated in well-grown large spherulites of PDTDPPQT. The charge carrier mobility along the radial direction of the spherulites was measured to be 5.46-12.04 cm(2) V(-1) s(-1), which is significantly higher than that in the direction perpendicular to the radial direction. The dynamic response of charge transport was also investigated by applying a pulsed bias to TFTs loaded with a resistor (∼20 MΩ). The charge-transport behaviors along the radial direction and perpendicular to the radial direction were investigated by static and dynamic experiments through a resistor-loaded (RL) inverter. The RL inverter made of PDTDPPQT-based TFT operates well, maintaining a fairly high switching voltage ratio (Vout(ON)/Vout(OFF)) at a relatively high frequency when the source-drain electrodes are aligned parallel to the radial direction.
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Jae Yoon
authors.initials: JY
authors.lastname: Kim
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Da Seul
authors.initials: DS
authors.lastname: Yang
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Jicheol
authors.initials: J
authors.lastname: Shin
authors.affiliation: ‡Department of Materials Science and Engineering, Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.
authors.forename: David
authors.initials: D
authors.lastname: Bilby
authors.affiliation: ‡Department of Materials Science and Engineering, Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.
authors.forename: Kyeongwoon
authors.initials: K
authors.lastname: Chung
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Hyun Ah
authors.initials: HA
authors.lastname: Um
authors.affiliation: §Department of Chemistry, Konkuk University, 1 Hwayang-dong, Kwangjin-gu, Seoul 143-701, Republic of Korea.
authors.forename: Jaehee
authors.initials: J
authors.lastname: Chun
authors.affiliation: §Department of Chemistry, Konkuk University, 1 Hwayang-dong, Kwangjin-gu, Seoul 143-701, Republic of Korea.
authors.forename: Seungmoon
authors.initials: S
authors.lastname: Pyo
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Min Ju
authors.initials: MJ
authors.lastname: Cho
authors.affiliation: ‡Department of Materials Science and Engineering, Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.
authors.forename: Jinsang
authors.initials: J
authors.lastname: Kim
authors.affiliation: †Department of Chemistry, Research Institute for Natural Sciences, Korea University, 5 Anam-dong, Sungbuk-gu, Seoul 136-701, Republic of Korea.
authors.forename: Dong Hoon
authors.initials: DH
authors.lastname: Choi
keywords: alignment; conjugated polymer; diketopyrrolopyrrole; epitaxy; thin-film transistor