The AFM topographs suggest that fabrication of even shorter channels may be possible. The process is robust with respect to variations of the droplet volume or the distance d, which are caused by external perturbations of the droplet flight direction or changing ejection conditions at the nozzle. Device yields in our experiments, which were performed in a normal laboratory atmosphere, appear to be limited only by dust contamination. No evidence for accidental shorts between source and drain electrodes was found.

 
The polyimide has a dual function. It not only provides accurate channel definition; when rubbed mechanically, it also acts as an aligning template for the self-organization of the semiconducting polymer that is crucial for achieving high field-effect mobilities. F8T2 is a rigid-rod polymer with a nematic liquid-crystalline phase above 265degreesC and can be aligned into a monodomain on top of the rubbed polyimide line by bringing it into the liquid-crystalline phase and subsequently quenching it.


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