The actual OFETs consisted of the centro-apically phase-separated organic semiconductor channel and a gate dielectric of an underlying polymer matrix exhibited a good performance approaching previously reported values of devices prepared via either the spin-casting or drop-casting methods.
Unlike with inkjet printing which struggles with dispensing highly viscous solutions i. The viscosity of t he blend solution used in this work was approximately 1, cP, which is virtually unusable in inkjet printing. The higher boiling point of the solvent ensures stable printing without clogging of the tip end. It also, provides more time for the phase separation or self-organization of the molecules in the printed solution during the solvent evaporation Interestingly, spherulitic-like crystals, particularly positioned at the center region of the printed line, were observed from a polarized OM image POM.
The crystalline domains were uniformly formed along the length of the printed line and appeared as a separate crystalline stripe inside the printed line.
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As shown in Fig. S1 in the supplementary information SI. The SEM image clearly shows the distinct layer boundary, which is derived from the vertical phase separation.