Mobility boost up of hybrid TFT with solvent-free cross-linked polyurethane-ionic liquid gate dielectric

We proposed solvent-free cross-linked ion gel polymer as a high-kappa gate dielectric composed with polyurethane terminated with acrylate functional group and ionic liquids (1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide) through ultra violet curing (UV-cured IL-PU). Free-standing UV-cured IL-PUs were applied as gate insulator by conformally contacting on the amorphous indium gallium zinc oxide side-gate structure thin film transistor with a simple ex situ method. The device shows a dramatic improvement of electrical performances even under low operating voltage conditions; on/off ratio similar to 10(4), field effect mobility at linear region 47.79 +/- 17.65 cm(2) V-1 s(-1), sub-threshold swing 145.54 +/- 16.65 mV decade(-1) at V-DS = 0.1 V and V-GS sweep from -3 to 2 V. (C) 2019 The Japan Society of Applied Physics