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Category International Presentation
Paper Title Improvement of micro-contact patterning fidelity of organic semiconductors through ultraviolet ozone treatment on nanoporous stamps
Conference name SPIE 2015
Author Hea-Lim Park, Bo-Yeon Lee, Chang-Min Keum, Se-Um Kim, Min-Hoi Kim
Paper code Place
page Year/date 2015/08/12
Abstract Among various kinds of organic semiconductor (OSC) materials, 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-PEN) has widely been investigated due to its relatively high mobility and possibility of cost-effective fabrication by solution process. In spite of these advantages, the practical application of TIPS-PEN for the large-area devices still struggles to satisfy the industrial figures of merit, since it is challenging to obtain the precise pattern together with the uniform film properties of solution-processed TIPS-PEN. It should be noted that the patterning of OSC films with high pattern fidelity is significant to eliminate the undesirable current pathway and thus to ensure the performance reliability between individual device components.
In this work, we demonstrated the effect of ultraviolet ozone (UVO) treatment of a polydimethylsiloxane (PDMS) stamp on the micro-contact patterning fidelity of TIPS-PEN film. Here, TIPS-PEN was blended with an insulating organic polymer to enhance the uniformity of TIPS-PEN films. For patterning, the UVO-treated PDMS stamp having micrometer-scale patterns was contacted with a thin film of blended TIPS-PEN uniformly coated on a substrate by spin-coating. During this process, the nanoporous PDMS stamp absorbed the TIPS-PEN monomers through the contact area, generating the complementary patterns of TIPS-PEN. It was found that the pattern fidelity was greatly improved by increasing the UVO treatment time on PDMS stamps from 0 to 30 minutes. Our approach for achieving high pattern fidelity by a simple and low-cost patterning technique will provide a useful platform for integration of solution-processed organic electronic devices.

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