Strategy from the Fabrication of Polymer Thin Film Transistor on Rigid and Flexible Substrate to LTspice Simulation Towards Circuit Applications

Solution-processed polymer-based organic thin-film transistors (OTFT) have been used in various applications over the past decade due to the advantages of low-temperature processing, inexpensive technology abundant dielectric and semi-conductors materials, and their processing compatibility with flexible substrates. In this work comparision of OTFT fabricated on the flexible and rigid substrate is accomplished using cross-linked poly(4-vinyl phenol) (c-PVP) as polymer gate dielectric and poly[2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene] (PBTTT-c14) as polymer semiconductor. The dielectric cross-linking is accomplished at comparatively much lower temperatures to achieve solution processing on the flexible polyethylene terephthalate (PET) substrate. The spice Level-1 model parameters for the OTFTs on glass and flexible substrates are extracted from DC characteristics. Finally the DC characteristics are simulated using LTspice simulator incorporating the extracted parameters. The extracted model parameter of OTFT can be used for circuit design and applications.