Organic electronics is an emerging technology with advantages of mechanical flexibility, solution-processability, and high-throughput manufacturing at low temperatures on inexpensive and light-weight substrates such as plastic, paper, and fiber in large-scales not possible with high-temperature processing techniques. While the performance of devices cannot rival the silicon counterpart, the performance should be tuned to meet the required specifications of the application in mind. This thesis will overview the performance of the organic thin transistors (OTFTs) and organic phototransistors (OPTs) optimized and used for circuits and large area sensing applications. The work first covers the printing techniques employed for the fabrication of organic devices on the flexible substrate. There have been device-level optimizations for scale ratio tuning and power improvement by using a bilayer gate dielectric structure. We also introduce a novel technique for rapid and digital modulation of the scale ratios. Interconnection is done with the screen printing method for the fabrication of printed flexible logic circuits and an OTFT weak classifier for data classification. The OPTs, with a good dual performance as both transistor and photodetector, are capable of merging the sensing and function generation in one substrate, which can reduce system complexity.




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