Organic Thin-Film Transistors Fabricated by Microcontact Printing

We have developed a new printing method based on microcontact printing, where an image of dried ink is transferred from a stamp to a substrate via two steps. Combination of two-dimensional press and one-dimensional press enables high resolution printing on a large area using silver nanoparticle ink and poly(3-hexylthiophene) ink. A channel length below 10 mu m was successfully obtained. Furthermore, we have succeeded in fabricating organic thin-film-transistor arrays with large area and high precision, 150mm square area and 200 ppi, respectively, entirely by solution and printing processes. (C) 2010 The Japan Society of Applied Physics