Low voltage operation of picene thin film field-effect transistor (FET) has been realized with 40 nm thick SiO2 gate dielectrics coated by two polymers, Cytop and polystyrene. The picene FETs operated in low absolute gate voltage VG below 15 V for Cytop coated SiO2 and 30 V for polystyrene coated SiO2 gate dielectrics, and they showed a significant O2 gas sensing effect down to ∼10 ppm. Photoemission spectrum clarified that O2 molecules penetrate into the thin films at O2 /picene mole ratio of 1: 1. X-ray diffraction pattern of picene thin films showed highly oriented growth on the polymer-coated SiO2.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)