Multiwall Carbon Nanotube and Poly(3,4-ethylenedioxythiophene): Polystyrene Sulfonate (PEDOT:PSS) Composite Films for Transistor and Inverter Devices

Abstract

Highly conductive multiwalled carbon nanotube (MWNT)/Poly(3,4-ethylenedioxythiophene) polymerized with poly(4-styrenesulfonate) (PEDOT: PSS) films were prepared by spin coating a mixture solution was prepared by dispersing MWNT in the PEDOT PSS solution in water using ultrasonication without any oxidation process. The effect of the MWNT loading in the solution on the film properties such as surface roughness work function surface energy optical transparency, and conductivity was studied. The conductivity of MWNT/PEDOT: PSS composite film was increased with higher MWNT loading and the high conductivity of MWNT/PEDOT: PSS films enabled to be used as a source/drain electrode in organin thin film transistor (OTFT). The pentacene TFT with MWNT/PEDOT: PSS S/D electorde whowed much higher performance with mobility about 0.2 cm(2) (V s) and on/off ratio about 5 x 10(5) compared to that with PEDOT: PSS S/D electorode (similar to 0.05 cm(2/) (Vs), 1 x10(5)). The complementary inverters exhibited excellent characteristics including high gain value of abouts 30