Patterning Organic-Semiconductors by Solution Coating and Controlling Crystallinity on a Large-Area
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Organic thin film transistor (OTFT) have received the most attention due to their inherent advantageous properties, such as, a variety of material options, flexibility, and affordability. To enhance performance OTETs, it is important to regulate the arrangement and structure of organic materials. For that reason, flow coating was exploited to fabricate OSCs patterns for OTFT. The shearing of solution could enhance the molecular orientation of OSCs in nano-scales. Here, we demonstrated that a high-performance semiconducting film using the flow coating method, a method for sharing a solution combined with the coffee ring effect, giving mechanical shear stress. The identification of the crystallization mechanism included the dependence of coating speed, solution concentration, and solution evaporation. Such a method could effectively control the crystallinity of organic semiconductor material and enhance device performance.