| Summary: | 碩士 === 國立清華大學 === 材料科學工程學系 === 98 === In this study, a novel anthracene derivative, anthracenetetracarboxylic acid (ATC) , was synthesized for organic thin film transistors (OTFTs) . This anthracene derivative, with the semiconductor properties of its core, was functionalized with carboxylic groups on 2, 3:6, 7 positions. With these hydrophilic carboxylic acid groups, ATC could be selective grown onto the gate dielectric layer (SiO2) modified with hydrophilic self-assembled monolayer (SAM), located between the source and drain metal, to form OTFTs via solution process directly.
In order to meet the requirements of low-cost (large-area printing production), low process temperature (<200 ?aC) for future flexible electronics applications and the feasibility to be integrated with integrated circuits, this research is mainly focused on the following two major goals. Firstly, to avoid of the damages of the ecological environment, it is important to improve the solubility of organic semiconductors in environmentally friendly solvents. Secondly, via solution processes, selective growth of organic semiconductor film directly on the selected location is developed to reduce the process cost. Results showed that anthracene derivative ATC could be successfully synthesized. With its unique hydrophilic property and the use of environmentally friendly hydrophilic solvent, selective growth of ATC organic semiconductor film on gate dielectric modified with hydrophilic SAM was achieved to form OTFTs directly. Transistor characteristics of such OTFTs were measured in air, with a mobility of about 10-2 cm2V-1s-1, a threshold voltage of -1.5 V and an on/off current ratio about 102. Results above have demonstrated the feasibility of using solution-processed, hydrophilic organic semiconductor ATC for OTFTs fabrication and future flexible electronics application.
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