Fabrication of Printed Organic Thin-Film Transistors Using Roll Printing

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The roll-printed electrodes of organic thin-film transistors (OTFTs) were fabricated by gravure or flexography printing using engraved plates with various channel lengths and nanoparticle silver (Ag) pastes on flexible $150 \times 134$ mm2 plastic substrates. The roll-printed OTFTs used poly(vinyl phenol) (PVP) polymeric dielectrics and bis(triisopropyl-silylethynyl) pentacene (TIPS-pentacene) organic semiconductors. Depending on the choice of the type of roll-printing method, the printed OTFTs obtained had a field-effect mobility between 0.08 and 0.1 cm2 V-1 s-1, an on/off current ratio between $10^{4}$ and $10^{5}$, and a subthreshold slope between 1.94 and 2.53 V/decade. The roll printing and soluble processes made it possible to fabricate a printed OTFT with a channel length between 16 to 62 μm on a plastic substrate; this was not previously possible using traditional printing techniques. The proposed fabrication process was 20 steps shorter than conventional fabrication techniques.
2009-04-25