Fabrication of Organic Thin-Film Transistors with Roll-Printed Electrodes Using Patterned Polymer Stamp

Abstract

The roll-printed electrodes of organic thin-film transistors (OTFTs) were fabricated by gravure or flexography printing using patterned poly(dimethylsiloxane) (PDMS) stamp with various channel lengths and low-resistance silver (Ag) paste on plastic substrates. The roll-printed OTFTs used poly(vinyl)(phenol) polymeric dielectrics and bis(triisopropyl-silylethynyl) pentacene organic semiconductors. The roll-printed OTFTs obtained had a field-effect mobility 0.08 (±0.02) cm²/Vs, an on/off current ratio of 10⁴ and a subthreshold slope of 2.53 V/decade. The roll printing using patterned PDMS stamp for Ag paste transferring made it possible to fabricate a printed OTFT with a channel length as small as to 12 μm on plastic substrate.

Keywords:

• Ag paste
• organic thin-film transistors
• PDMS stamp
• printed OTFT
• roll printing

Acknowledgments

This research was supported by the Korea Research Council for Industrial Science and Technology (KOCI) and Korea Foundation for International Cooperation of Science and Technology (KICOS) through Global Partnership Program (GPP).