Berlin 2005 – scientific programme

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SYOO: Organic Optoelectronics and Photonics

SYOO 6: Poster

SYOO 6.64: Poster

Monday, March 7, 2005, 18:00–20:00, Poster TU A

Patterning of thin films for organic electronic and photonic devices by microcontact printing and selective surface dewetting — •Amare Benor, Dietmar Knipp, and Veit Wagner — International University Bremen, School of Science and Engineering,

Non-lithographic methods for patterning of thin films are desirable to realize inexpensive organic electronic and photonic devices on the micro and nanoscale. Microcontact printing (µCP) was used to pattern Ag, Au and ITO films on silicon and glass substrates. In the first step of the patterning scheme self-assembly monolayers (SAMs) like octadecyltrichlorosilane (OTS, CH₃(CH₂)₁₇SiCl₃) were microcontact printed on different substrates to define hydrophobic and hydrophilic areas. The modified surface energies lead to selective dewetting of the substrate which was used to pattern resists like Poly(methyl methacrylate), PMMA. A standard lift-off process was applied to finally pattern the Ag, Au and ITO films. Such scheme can be used to pattern electrodes for organic light emitting diodes or organic thin film transistors. The influence of the different processing parameters on the resolution of the patterning scheme will be discussed. Moreover, the influence of microcontact printed Au drain and source contacts on the performance of small molecule based organic thin film transistors will be discussed in greater detail.