4.5 Article

Mixing-Induced Orientational Ordering in Liquid-Crystalline Organic Semiconductors

期刊

ADVANCED MATERIALS INTERFACES
卷 9, 期 35, 页码 -

出版社

WILEY
DOI: 10.1002/admi.202201789

关键词

field-effect transistors; organic semiconductors; phase transition; printed electronics; smectic liquid crystals

资金

  1. JST CREST from the Japan Science and Technology Agency (JST) [JPMJCR18J2]
  2. JSPS KAKENHI grants from the Japan Society for the Promotion of Science (JSPS) [JP21K05209, JP20H05867, JP21H05234, JP22H01933]
  3. Photon Factory Program Advisory Committee [2020S2-001]
  4. Kao Foundation for Arts and Sciences
  5. Nanotechnology Platform of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan

向作者/读者索取更多资源

This study demonstrates the control of long-axis molecular ordering under ambient conditions using unsymmetrically alkylated OSCs with high layered crystallinity, leading to improved hole mobility in transistor characteristics.
Organic semiconductors (OSCs) often exhibit thermotropic liquid-crystalline (LC) phases in which molecular orientational order is partially lost. The formation of a temporary LC state via a solution process is expected to promote printing-based device production, although a method of controlling molecular ordering over LC states has not yet been developed. Here, it is demonstrated that long-axis molecular ordering can be controlled under ambient conditions using unsymmetrically alkylated OSCs with high layered crystallinity. Introducing a small amount of OSC molecules with longer alkyl-chain lengths leads to the conversion of the long-axis disordered phase into a bilayer-type ordered phase with improved hole mobility in the transistor characteristics. Analyses of the entropies of the transitions to the smectic LC phases at elevated temperatures demonstrate that the long-axis molecular ordering can be driven by a balance between intralayer flip-flop motion and core-core interactions through LC phases. The proposed LC-mediated solution processing paves the way toward high-end printed electronics.

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