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

Abstract

We proposed solvent-free cross-linked ion gel polymer as a high-κ 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 ∼104, field effect mobility at linear region 47.79 ± 17.65 cm2 V−1 s−1, sub-threshold swing 145.54 ± 16.65 mV decade−1 at VDS = 0.1 V and VGS sweep from −3 to 2 V.

Efficient integrated photo-charging storage device operating at 3 V

“…The cell con guration was stainless steel (SUS) / ionogel / SUS. The ionogel is stable up to 4.1 V. This wide electrochemical stability was attributed to the hydrogen bonds formed between EMITFSI and PUA 25 . Symmetric type SC was fabricated with the activated carbon (AC) electrode and ionogel electrolyte.…”

Impact of polymer chemistry on the application of polyurethane/ureas in organic thin film transistors

“…The ionic PU was also used as the gate dielectric to construct indium gallium zinc oxide (IGZO)-based thin film transistors. 73,74 The large capacitance of the ionic PU allowed one to operate the transistor at a very low threshold voltage (0.3 V). While an ion-gel dielectric can offer large capacitance, the microphase separation caused by physical blending still leads to high leakage current.…”