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Description:

Numerous rod-like organic molecules self-organize into layered structures, as demonstrated in various systems, including smectic liquid crystals, micelles, and lipid bilayers, owing to side-by-side intermolecular interactions. These layered structures are of interest to another class of layered molecular assemblies in the solid state, namely, small-molecule organic semiconductors (OSCs). Many OSCs are composed of various π-electron cores substituted with flexible side chains. Layered-structure formation is important in OSC systems because it enables the production of aligned molecular layers interfaced with gate dielectric layers, which are used to fabricate high-performance organic thin-film transistors (OTFTs). Using these rod-shaped OSCs, we developed a technique for fabricating single-crystal thin films of uniform thickness at the molecular level by introducing a geometric frustration effect between the layers. We also selectively produced crystalline polymorphs with distinct herringbone packing motifs. By producing these layer-controlled films on the trap-minimized surface of gate insulators, we fabricated OTFTs exhibiting sharp on/off switching characteristics approaching the Boltzmann limit. In this paper, we introduce recent techniques for the rational design of organic semiconductors.

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  Copyright 2024 Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
  
  
  
  S. Arai, "Advanced self-assembly control of rod-shaped organic semiconductors," Proc. SPIE 12907, Emerging Liquid Crystal Technologies XIX, 1290705 (13 March 2024); https://doi.org/10.1117/12.3001198

Keyword: organic semiconductors, self-assembly, sharp-switching transistors

Date published: 2024-03-13

Publisher: SPIE

Journal:

• Proceedings of SPIE - The International Society for Optical Engineering (ISSN: 0277786X) vol. 12907 1290705

Funding:

• JSPS KAKENHI 21H05234
• JSPS KAKENHI 22H01933
• JST PRESTO JPMJPR23N1
• MEXT Leading Initiative for Excellent Young Researchers JPMXS0320220012

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1117/12.3001198

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Updated at: 2024-08-19 16:30:26 +0900

Published on MDR: 2024-08-19 16:30:26 +0900