Investigation of gate dielectric conduction properties in organic p-type staggered thin-film transistors is reported by means of direct-current, capacitance-voltage, and noise measurements. Results suggest that transport in the CYTOPTM gate dielectric is dominated, at low currents, by Schottky conduction due to the emission at the aluminum gate interface through a barrier φ B ≈ 1 eV, while is limited, at higher currents, by space-charge conduction in the trap-limited regime with an effective mobility μ θ estimated in the order of 10 -9 cm 2 /(Vs). Gate current noise follows a 1/f law and it is found to be proportional to I 2 G , which is inconsistent with the commonly assumed mobility fluctuation. Traps responsible for gate noise are dielectric-bulk traps, not located at the semiconductor interface, since the gate noise is found to be uncorrelated with drain noise.
19 Oct 2016
Volume: 37 Issue: 12 Pages: 1625-1627
IEEE Electron Device Letters