Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 23: POSTER Functional Organic Thin Films
CPP 23.20: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Patterning of Thin Films for Organic Electronics by Microcontact Printing of Self Assembled Monolayers — •Amare Benor, Kah-Yoong Chan, and Dietmar Knipp — International University Bremen, School of Engineering and Science, 28759 Bremen, Germany
Micro Contact Printing (µCP) has become widely used technique in patterning thin film structures on the micron and nanoscale. Printing self-assembled monolayers (SAMs) in combination with selective surface wetting was used to realize radio frequency micro coils and electrodes of pentacene thin film transistors for radio frequency information tags (RFID tags). In this study we used the self-assembled monolayers (Octadecyltrichlorosilane, OTS), CH3(CH2)17SiCl3, which was printed on cleaned silicon or glass substrate by a poly(dimethylsiloxane), PDMS. The printed monolayer leads to the formation of hydrophobic regions, and the unprinted region remained hydrophilic which facilitates the selective deposition of polymers or resists like Poly(methyl methacrylate), PMMA on the hydrophilic region. In the next step, a standard lift-off process was used to pattern gold, titanium metal thin films. This technique was applied to realize radio frequency (RF) coils and electrodes for pentacene thin film transistors. The influence of processing parameters like: the geometry of the structures, the chemistry of the heterogeneous substrate and the polymer will be discussed. Moreover, fundamental printing limits of the method will be seen based on simple model to describe the limiting factors. Finally, the pentacene transistors will be compared with transistors prepared by optical lithography.