Multifunctional, Room-Temperature Processable, Heterogeneous Organic Passivation Layer for Oxide Semiconductor Thin-Film Transistors

Abstract

In recent decades, oxide thin-film transistors (TFTs) have attracted a great deal of attention as a promising technology in terms of next-generation electronics due to their outstanding electrical performance. However, achieving robust electrical characteristics under various environments is a crucial challenge for successful realization of oxide-based electronic applications. To resolve the limitation, we propose a highly flexible and reliable heterogeneous organic passivation layer composed of stacked parylene-C and diketopyrrolopyrrole-polymer films for improving stability of oxide TFTs under various environments and mechanical stress. The presented multifunctional heterogeneous organic (MHO) passivation leads to high-performance oxide TFTs by: (1) improving their electrical characteristics, (2) protecting them from external reactive molecules, and (3) blocking light exposure to the oxide layer. As a result, oxide TFTs with MHO passivation exhibit outstanding stability in ambient air as well as under light illumination: the threshold voltage shift of the device is almost 0 V under severe negative bias illumination stress condition (white light of 5700 lx, gate voltage of −20 V, and drain voltage of 10.1 V for 20 000 s). Furthermore, since the MHO passivation layer exhibits high mechanical stability at a bending radius of ≤5 mm and can be deposited at room temperature, this technique is expected to be useful in the fabrication of flexible/wearable devices.

Handwritten and Sustainable Electronic Logic Circuits with Fully Printed Paper Transistors

“…The increase of | I GS | as well as decrease of I ON over the weeks can be associated to the reactivity of the ZnO nanostructures with protons and hydroxyl ions from the electrolyte, leading to the formation of zinc complexes under potential biases and/or UV light illumination. [ 76,86,87 ]…”

“…The increase of |I GS | as well as decrease of I ON over the weeks can be associated to the reactivity of the ZnO nanostructures with protons and hydroxyl ions from the electrolyte, leading to the formation of zinc complexes under potential biases and/or UV light illumination. [76,86,87] It is also important to mention that the electrolyte and the office paper platform that hosts the printed layers can be stored separately for long periods of time (tested after one year of storage under ambient conditions) without degradation of performance. Since electrical degradation occurs after lamination of the electrolyte, the as-prepared devices are best suited for low-cost, portable, and disposable applications on-the-spot.…”

Self-Assembled Monolayers (SAMs)/Al2O3 Double Layer Passivated InSnZnO Thin-Film Transistor

“…According to the results of the contact angle test, the surface of ITZO is changed from hydrophilic to hydrophobic after passivation by SAMs/Al2O3. It can be seen that compared with the lower hydrophobicity of the Al2O3 passivation layer, the modification of the Al2O3 passivation layer by SAMs further strengthens the hydrophobic property of the passivation layer and enhances the barrier ability of the passivation layer to water in the air, which is conducive to the improvement of the device performance, especially the stability of the device [11][12][13][14]26].…”

“…This is mainly due to the modification of the Al2O3 passivation layer by SAMs, which makes a thin hydrophobic layer formed on the surface of the Al2O3 passivation layer. The hydrophobic layer enhances the barrier ability of the passivation layer to H2O molecules and improves the effect of the passivation layer [11,12,26]. The electrical stability of the ITZO TFTs with SAMs/Al2O3 dual PVLs under various humidity conditions was also investigated, as shown in Fig.…”

Towards a Mechanistic Model of Solid-Electrolyte Interphase Formation and Evolution in Lithium-ion Batteries

“…The stabilization of reactive surfaces by passivation films is a cornerstone process with myriad technological applications ranging from alloys [1][2][3] and microelectronics [4][5][6] to photovoltaics 7,8 and batteries. 9,10 While extensive efforts have been made to develop carefully controlled artificial passivation layers, [11][12][13][14][15] many technologically relevant passivation processes occur spontaneously by mechanisms that are highly sensitive to the environment.…”