From Basics to Applications for Polymer Industry (영어발표)
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High Performance DFBT-Based Conjugated Polymers for Organic Thin Film Transistors
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Difluorobenzothiadiazole (DFBT)-Based Conjugated Polymers for Organic Thin Film Transistors were synthesized. Polymers consist of highly planar 4,7-bis(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b']dithiophen-2-yl)-5,6-difluorobenzo[c][1,2,5]thiadiazole (DFD) moieties and aromatic linking groups (thiophene and selenophene: PDFDT and PDFDSe, respectively). Comparative study revealed that PDFDSe polymer tends more aggregating in solution phase and generates a more oxidizable conjugated system and better packed crystalline states in films with exclusive edge-on orientations. PDFDSe-based organic thin film transistor (OTFT) with top gate bottom contact geometry performed better than PDFDT-based OTFT. In addition, we have achieved high carrier mobilites using various gate dielectric materials. In this talk, I will present not only the structure-property relationship but also the important role of employed gate dielectric layers in the OTFT research.