Precise orientation control of a liquid crystal organic semiconductor via anisotropic surface treatmentopen access
- Authors
- Han, Moon Jong; Wei, Dayan; Yun, Hee Seong; Lee, Seong-hun; Ahn, Hyungju; Walba, David M.; Shin, Tae Joo; Yoon, Dong Ki
- Issue Date
- Dec-2022
- Publisher
- NATURE PORTFOLIO
- Citation
- NPG ASIA MATERIALS, v.14, no.1
- Journal Title
- NPG ASIA MATERIALS
- Volume
- 14
- Number
- 1
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89425
- DOI
- 10.1038/s41427-022-00377-5
- ISSN
- 1884-4049
- Abstract
- We report a three-dimensional (3D) molecular orientation control of a liquid crystal organic semiconductor (LC-OSC) based on the long-range ordering characteristic of an LC material. To this end, a synthetic LC-OSC molecule, MeOPh-BTBT-C8, with a fluidic nematic (N) phase that is essential for alignment control over a large area and a smectic E (SmE) phase showing high ordering, was prepared. A simple flipping of a sandwich cell made of the LC-OSC material between the top and bottom substrates that have uniaxial-planar degenerated alignment as well as crossed rubbing directions responds to the given surface anchoring condition and temperature gradient. Optical observation of the alignment-controlled LC-OSC was carried out by polarized optical microscopy (POM), and the corresponding charge carrier mobility was also measured by fabricating organic field-effect transistors (OFETs). Our platform offers a facile approach for multidirectional and multifunctional organic electronic devices using the stimulus-response characteristics of LC materials.
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