Advanced self-assembly control of rod-shaped organic semiconductors

S. Arai

doi:10.1117/12.3001198

13 March 2024 Advanced self-assembly control of rod-shaped organic semiconductors

S. Arai

Proceedings Volume 12907, Emerging Liquid Crystal Technologies XIX; 1290705 (2024) https://doi.org/10.1117/12.3001198
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

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.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

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

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