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Printing technology and advantage of purified semiconducting carbon nanotubes for thin film transistor fabrication on plastic films

Fabrication technology for printed carbon nanotube (CNT) transistors was developed. All electrodes, insulators, and CNT channels were directly printed and CNT thin film transistors (TFTs) were fabricated on plastic films without additional patterning processes. In this fabrication, surface free energy was controlled and a mechanism for adsorbing CNTs was applied to form a random network channel. Purified semiconducting CNT ink was used and the TFT characteristics clearly demonstrated the advantages of the ink. This increased the on-current of the printed CNT-TFT without deterioration in the on/off ratio. A large field-effect mobility of 3.6 cm2/Vs was obtained for the printed CNT-TFT with an on/off ratio of about 1,000.