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Shin, Tae Joo
UNIST Synchrotron Radiation Research Laboratory
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  • Synchrotron Radiation Application Researches

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Molecular Orientation Control of Liquid Crystal Organic Semiconductor for High-Performance Organic Field-Effect Transistors

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Title
Molecular Orientation Control of Liquid Crystal Organic Semiconductor for High-Performance Organic Field-Effect Transistors
Author
Han, Moon JongLee, Don-WookLee, Eun KyungKim, Joo-YoungJung, Ji YoungKang, HyunbumAhn, HyungjuShin, Tae JooYoon, Dong KiPark, Jeong-Il
Issue Date
2021-03
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.13, no.9, pp.11125 - 11133
Abstract
The control of molecular orientation and ordering of liquid crystal (LC) organic semiconductor (OSC) for high-performance and thermally stable organic thin-film transistors is investigated. A liquid crystalline molecule, 2-(4-dodecyl thiophenyl) [1]dibenzothiopheno[6,5-b:6',5'-f]-thieno[3,2-b]thiophene (C12-Th-DBTTT) is synthesized, showing the highly ordered smectic X (SmX) phase, demonstrating molecular reorganization via thermal annealing. The resulting thermally evaporated polycrystalline film and solution-sheared thin film show high charge carrier mobilities of 9.08 and 27.34 cm(2) V-1 s(-1), respectively. Atomic force microscopy and grazing-incidence X-ray diffraction analyses prove that the random SmA(1)-like structure (smectic monolayer) is reorganized to the highly ordered SmA(2)-like structure (smectic bilayer) of C12-Ph-DBTTT at the crystal-SmX transition temperature region. Because of the strong intermolecular interactions between rigid DBTTT cores, the thin film devices of C12-Th-DBTTT show excellent thermal stability up to 300 degrees C, indicating that LC characterization of conventional OSC materials can obtain high electrical performance as well as superior thermal durability.
URI
https://scholarworks.unist.ac.kr/handle/201301/52693
URL
https://pubs.acs.org/doi/10.1021/acsami.0c22393
DOI
10.1021/acsami.0c22393
ISSN
1944-8244
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