title: Centro-Apical Self-Organization of Organic Semiconductors in a Line-Printed Organic Semiconductor: Polymer Blend for One-Step Printing Fabrication of Organic Field-Effect Transistors.
abstract: Here we report the first demonstration for centro-apical self-organization of organic semiconductors in a line-printed organic semiconductor: polymer blend. Key feature of this work is that organic semiconductor molecules were vertically segregated on top of the polymer phase and simultaneously crystallized at the center of the printed line pattern after solvent evaporation without an additive process. The thickness and width of the centro-apically segregated organic semiconductor crystalline stripe in the printed blend pattern were controlled by varying the relative content of the organic semiconductors, printing speed, and solution concentrations. The centro-apical self-organization of organic semiconductor molecules in a printed polymer blend may be attributed to the combination of an energetically favorable vertical phase-separation and hydrodynamic fluids inside the droplet during solvent evaporation. Finally, a centro-apically phase-separated bilayer structure of organic semiconductor: polymer blend was successfully demonstrated as a facile method to form the semiconductor and dielectric layer for OFETs in one- step.
authors.affiliation: Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Seoul, 136-791, Korea.|Department of Chemical and Biological Engineering, Korea University, Seoul, 136-713, Korea.
authors.forename: Su Jin
authors.initials: SJ
authors.lastname: Lee
authors.affiliation: Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon, 305-764, Korea.
authors.forename: Yong-Jae
authors.initials: YJ
authors.lastname: Kim
authors.affiliation: Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Seoul, 136-791, Korea.
authors.forename: So Young
authors.initials: SY
authors.lastname: Yeo
authors.affiliation: Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon, 305-764, Korea.
authors.forename: Eunji
authors.initials: E
authors.lastname: Lee
authors.affiliation: Electronic Materials and Device Research Center, Korea Electronics Technology Institute, Gyeonggi-do, 463-816, Korea.
authors.forename: Ho Sun
authors.initials: HS
authors.lastname: Lim
authors.affiliation: Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea.
authors.forename: Min
authors.initials: M
authors.lastname: Kim
authors.affiliation: Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Seoul, 136-791, Korea.
authors.forename: Yong-Won
authors.initials: YW
authors.lastname: Song
authors.affiliation: Department of Chemical and Biological Engineering, Korea University, Seoul, 136-713, Korea.
authors.forename: Jinhan
authors.initials: J
authors.lastname: Cho
authors.affiliation: Center for Opto-Electronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Seoul, 136-791, Korea.
authors.forename: Jung Ah
authors.initials: JA
authors.lastname: Lim