Electrical Conduction Mechanism in Plasma Polymerized 2-(diethylamino)Ethyl Methacrylate Thin Films

摘要

Thin films of different thicknesses were prepared through glow discharge of 2-(diethylamino) ethyl methacrylate (DEAEMA) using a capacitively coupled reactor. Current density-voltage (J-V) characteristics for plasma polymerized (PP) DEAEMA thin films of thicknesses 100, 200, 250, and 300 nm in aluminum/PPDEAEMA/aluminum sandwich configuration were studied over the temperature range from 298 to 423 K. J-V curves reveal that in the low-voltage region, the conduction current obeys Ohm's law while in the high-voltage region the behavior attributed to be space charge-limited conduction in PPDEAEMA thin films. The carrier mobility was calculated to be about 6.80 x 10(-19) to 2.38 x 10(-18) m(-2) V-1 s(-1) for various thicknesses. The free carrier density was found to be about 1.78 x 10(23) to 2.04 x 10(23) m(-3), and the trap density was found to be about 6.93 x 10(23) to 15.9 x 10(23) m(-3) for different thicknesses. The activation energies were estimated to be about 0.005-0.016 eV for 2 and 30 V of PPDEAEMA thin films of different thicknesses. The low-activation energies indicate that the thermally activated hopping conduction is operative in PPDEAEMA thin films. (C) 2015 Society of Plastics Engineers