Self-Defined Short Channel Formation With Micromolded Separator and Inkjet-Printed Source/Drain Electrodes in OTFTs

We demonstrated fabrication of self-defined short channel using inkjet printing and micromolding in capillary (MIMIC) methods. Self-defined source/drain electrodes were successfully formed when silver ink drops were printed on a silicon dioxide/p+ heavily doped silicon substrate having a prepatterned narrow high-aspect-ratio hydrophobic teflon separator made by MIMIC. We fabricated well-defined channel region of pentacene organic thin film transistors (OTFTs) with 5 and 10 μm channel lengths, which showed good mobilities of 0.1 ~ 0.2 cm²/V · s. Characteristics of the fabricated OTFTs were also analyzed in accordance with channel length and surface wetting properties.