Abstract
We report on low operating voltage transistors based on polymer-sorted semiconducting (6,5) single-walled carbon nanotube (SWNT) networks processed from solution at room temperature. The (6,5) SWNTs were separated from the as-received carbon nanotubes mixture using a polyfluorene-based derivative as the sorting and dispersing polymer agent. As-prepared devices exhibit primarily p-type behavior with channel current on/off ratio >10(3) and hole mobility approximate to 2 cm(2) V-1 s(-1). These transistor characteristics enable realization of low-voltage unipolar inverters with wide noise margins and high signal gain (>5). Polymer/(6,5) SWNT transistors were also fabricated on free-standing polyimide foils. The devices exhibit even higher hole mobility (approximate to 8 cm(2) V-1 s(-1)) and on/off ratios (>10(4)) while remaining fully functional when bent to a radius of 4 mm. (C) 2015 AIP Publishing LLC.