| Summary: | 碩士 === 臺灣大學 === 應用力學研究所 === 95 === An inkjet printing system was developed during the course of this thesis, which includes the inkjet printing stage, the computer programs for graphic pattern control, the inkjet drop observation system, and the pressure control system, etc. The stability of this system was found to be comparable or in certain cases superior to the commercially available system. Moreover, this system was used to fabricate silver leads, polymer capacitors, polymer thin film transistors, RC filters and inverters on flexible substrate, fulfilling the goal of “all-inkjet printing.”
Regarding the research achievements, the silver leads were created by using the “silver mirror reaction,” a process that has not been applied to the inkjet printing process before. The conductivity of the silver leads was found to reach 106S/m, which is only slightly less than that of the bulk silver. In addition, polymer capacitor with 453μF/m2 capacitance, the highest capacitance reported so far, was fabricated using the PEDOT and the PVP materials. Furthermore, RC filter developed by adopting these capacitors was found to filter signals effectively, both for low and high frequency ranges. Finally, various results regarding the development of the organic thin film transistors using the P3HT semiconductor material were detailed, which include the channel length, the thickness of dielectric layer and the semiconductor layer, etc. The organic thin film transistors were also fabricated on the flexible substrates by using newly developed inkjet printing platform. The mobility obtained is as high as 4.41×10-2cm2/V∙s and the on/off ratio reaches 103. It is the first transistor fabricated completely by using the “all-inkjet printing” and “all-polymer” up to date. Experimental data obtained confirms the performance of an inverter made by P3HT OTFT.
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