Patterning of Organic Semiconductors for All-solution Process via Flow Coating and Impacts of Coating Conditions on Electronic Properties
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In this study, we introduced the patterning method for the organic thin film transistor (OTFT). We exploited the flow coating method to modulate the physical and electronic properties of the conducting layer. Here, we demonstrated a high-performance semiconducting film with 6,13-Bis(triisopropylsilylethynyl)pentacene (TIPS-PEN) and Poly(3-hexylthiophene-2,5-diyl) (p3ht) both had fine holes transfer properties. The flow coating system, a solution shearing method combined with coffee ring effect, was adopted as a patterning method that rendered mechanical shear stress on a solution. The organic semiconductors with one directional alignment showed excellent electric properties. The identification of the crystallization mechanism was conducted including dependency of the coating speed, concentration of solution, and evaporation of solution. Such method could be a powerful method to control the crystallinity of the organic semiconductor material and to improve the device efficiency.