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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
Published on: June 18, 2013
Nanostructured organic semiconductors via directed supramolecular assembly
Benjamin J Rancatore1, Clayton E Mauldin, Shih-Huang Tung
1Department of Materials Science and Engineering, College of Chemistry, University of California, Berkeley, California 94720-1460, USA.
ACS Nano
|April 21, 2010
Summary
This study introduces a modular supramolecular method for creating uniform organic semiconductor films. This approach enables nanoscopic assembly and tailored alignment without sacrificing electronic properties, crucial for solution-processed devices.
Area of Science:
- Materials Science
- Organic Electronics
- Supramolecular Chemistry
Background:
- Organic small molecule semiconductors offer advantages over polymers.
- Solution processing of organic semiconductors requires uniform films and controlled nanostructure.
- Dewetting and alignment are critical challenges in fabricating organic semiconductor devices.
Purpose of the Study:
- To develop a modular supramolecular approach for fabricating nanostructured organic semiconductor films.
- To achieve uniform thin films with tailored nanoscopic features using solution processing.
- To maintain electronic properties while enabling self-assembly of organic semiconductors.
Main Methods:
- A quaterthiophene organic semiconductor was covalently attached to poly(4-vinylpyridine) via hydrogen bonds.
- Supramolecular assemblies were formed, acting as p-type semiconductors.
- Thin films were fabricated using solution processing, and their nanostructure and electronic properties were analyzed.
Main Results:
- The supramolecular assemblies formed microdomains (tens of nanometers) oriented normal to the surface.
- The field-effect mobilities of the supramolecules were comparable to the quaterthiophene alone (10(-4) cm(2)/(V.s)).
- The approach successfully eliminated dewetting and ensured film uniformity.
Conclusions:
- The modular supramolecular strategy is effective for solution processing of organic semiconductors.
- This method allows for the fabrication of functional, nanostructured organic semiconductor films.
- The approach is versatile due to the ease of substituting organic semiconductors.
