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Updated: Sep 23, 2025

Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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High-performance organic circuits based on precisely aligned single-crystal arrays.

Jingu Kang1, Minwook Lee1, Antonio Facchetti2,3

  • 1School of Electrical and Electronic Engineering, Chung-Ang University Seoul 06974 Republic of Korea skpark@cau.ac.kr.

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|May 11, 2022
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Summary

High-performance organic logic circuits were created using precisely controlled organic single-crystal arrays. This method enables tunable device dimensions and improved circuit performance for organic thin-film-transistors (OTFTs).

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Nanotechnology

Background:

  • Organic electronics offer potential for flexible and low-cost devices.
  • Achieving high performance in organic logic circuits requires precise control over material structure and device architecture.
  • Existing methods for fabricating organic thin-film-transistors (OTFTs) often face challenges in achieving uniform crystal alignment and high charge carrier mobility.

Purpose of the Study:

  • To demonstrate high-performance organic logic circuits using precisely controlled organic single-crystal arrays.
  • To develop a fabrication method for well-aligned microrod-shaped organic semiconductor crystals.
  • To investigate the relationship between device dimensions, crystal arrangement, and circuit performance.

Main Methods:

  • Fabrication of well-aligned microrod-shaped 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT) single-crystal organic thin-film-transistors (OTFTs).
  • Utilized solvent-mediated molecular tailoring with a polymeric sacrificial layer for precise crystal placement and orientation.
  • Assembled OTFT-based inverter circuits using the fabricated single-crystal microrod arrays.

Main Results:

  • Achieved saturation mobility of >2 cm^2 V^-1 s^-1 in C8-BTBT single-crystal OTFTs.
  • Successfully fabricated OTFT-based inverter circuits with a gain of 1.37 (V V^-1).
  • Demonstrated tunability of device dimensions and circuit performance by varying the number of single-crystal microrods.

Conclusions:

  • Precise control over organic single-crystal arrays enables high-performance organic logic circuits.
  • The developed fabrication technique allows for controlled orientation and placement of organic semiconductor crystals.
  • This approach provides a pathway for designing and optimizing organic electronic devices with tailored performance characteristics.