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Directly drawn poly(3-hexylthiophene) field-effect transistors by electrohydrodynamic jet printing: improving
Yong Jin Jeong1, Hyungdong Lee, Byoung-Sun Lee
1POSTECH Organic Electronics Laboratory, Polymer Research Institute, Department of Chemical Engineering, Pohang University of Science and Technology , Pohang 790-784, Korea.
ACS Applied Materials & Interfaces
|June 20, 2014
Summary
Directly printed poly(3-hexylthiophene) (P3HT) lines using electrohydrodynamic jet printing formed high-performance organic field-effect transistors (OFETs). Surface modifications significantly influenced P3HT line morphology and OFET electrical characteristics.
Area of Science:
- Materials Science
- Organic Electronics
- Nanotechnology
Background:
- Organic field-effect transistors (OFETs) are crucial for flexible electronics.
- Direct patterning of semiconducting polymers like poly(3-hexylthiophene) (P3HT) is essential for scalable OFET fabrication.
- Controlling the interface between the semiconductor and dielectric is key to optimizing OFET performance.
Purpose of the Study:
- To investigate the direct micropatterning of P3HT lines via electrohydrodynamic jet printing for OFET fabrication.
- To explore the impact of dielectric surface modifications (self-assembled monolayers, polymer films) on printed P3HT morphology and OFET characteristics.
- To demonstrate the potential for commercialization through large-area and flexible OFET arrays.
Main Methods:
- Electrohydrodynamic jet printing of P3HT without binders.
- Surface modification of dielectric layers using self-assembled monolayers (e.g., octadecyltrichlorosilane) and polymer thin films.
- Fabrication and electrical characterization of individual OFETs.
- Construction of 100-transistor arrays and flexible OFETs.
Main Results:
- Achieved direct micropatterning of P3HT lines with controlled morphology.
- Demonstrated that substrate surface energy and type significantly affect printed P3HT line characteristics.
- Obtained high-performance OFETs on octadecyltrichlorosilane-modified substrates, comparable to existing printed P3HT OFETs.
- Successfully fabricated large-area transistor arrays and low-operating-voltage flexible OFETs.
Conclusions:
- Electrohydrodynamic jet printing is a viable method for fabricating high-performance P3HT OFETs.
- Dielectric surface engineering is critical for optimizing the morphology and electrical properties of printed organic semiconductors.
- The developed techniques show promise for the commercialization of printed organic electronics, including flexible devices and large-area arrays.
