Deposition of composite materials using a wire-bar coater for achieving processability and air-stability in Organic Field-Effect Transistors (OFETs)

摘要

Organic thin films based on composite materials of semiconducting dibenzo-tetrathiafulvalene (DB-TTF) and insulating\udstyrenic matrices (Polystyrene (PS10k) and Poly-alpha methylstyrene (PAMS10k) ) have been fabricated by the wire-bar\udcoating technique in ambient conditions (air, light, humidity) and contrasted with the ones prepared by thermally\udevaporating the organic semiconductor. The transistors fabricated with DB-TTF:PS10k composites show a clear fieldeffect\udbehavior with p-type characteristics, exhibiting charge carriers mobilities in the range of 0.01 cm2/Vs, fully\udcomparable with the films obtained by thermal evaporation. However, while the thermally evaporated films show poor\udstability in air, the wire-bar coated composites films and devices are highly reproducible and exhibit lower threshold\udvoltage values. Thus, we demonstrate the suitability of the wire-bar technique for manufacturing large area devices.