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Direct inkjet printing of silver electrodes on organic semiconductors for thin-film transistors with top contact geometry
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16.When we characterized the surfaces of pentacene film before and after exposed to tetradecane as an organic solvent by using atomic force microscopy (AFM), the root mean square value of the surface was changed from 8 nm to 58 nm.
18.The size of the silver dots on the substrate is measured by using AFM, while the volume of a single silver ink droplet ejected from the inkjet head is estimated by multiplying the measured size by ten, which gives the Ag content in the solution.
20.Organic transistors with Au source/drain electrodes fabricated by vacuum evaporation are prepared as the reference device. The mobility and on-off ratio of the reference device are and , respectively.
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We have fabricated high-performance organic thin-film transistors with top contact geometry using silver source and drain electrodes that are directly patterned on pentacene film by inkjet printing. Ink droplets containing Agnanoparticles were ejected from inkjet nozzles. By controlling wave forms applied to piezoelectric actuators in these nozzles, the volume of the droplets can be changed from 17 to 1.4 pl. When the volume of the droplets is reduced, dc characteristics of manufactured transistors are improved significantly. The transistors manufactured with droplets of 1.4 pl exhibit a mobility of and an on-off current ratio that exceeding .
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