4.7 Article

Precise orientation control of a liquid crystal organic semiconductor via anisotropic surface treatment

期刊

NPG ASIA MATERIALS
卷 14, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41427-022-00377-5

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资金

  1. National Research Foundation (NRF) - Korean Government [MSIT: 2017R1E1A1A01072798, 2021M3H4A3A01050378, 2018R1A5A1025224, 2019K1A3A1A21031284, 2021R1A6A3A14039290]
  2. Soft Materials Research Center under US NSF MRSEC [DMR-1420736]
  3. MSIT
  4. POSTECH
  5. National Research Foundation of Korea [2021M3H4A3A01050378, 2019K1A3A1A21031284] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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We report a method for three-dimensional molecular orientation control of a liquid crystal organic semiconductor (LC-OSC) based on the long-range ordering characteristic of the LC material. By synthesizing LC-OSC molecules and designing a specific structure, the orientation control of LC-OSC can be achieved over a large area. Optical observation and electrical testing confirm the feasibility of this method, which is significant for the fabrication of multidirectional and multifunctional organic electronic devices.
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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