Improved Electrical and Temporal Stability of In-Zn Oxide Semiconductor Thin-Film Transistors With Organic Passivation Layer

Abstract

Solution-processed In-Zn oxide (IZO) semiconductor thin-film transistors (TFTs) were fabricated with passivation layers of either poly(methyl methacrylate) (PMMA) or cyclic transparent optical polymer (CYTOP). According to the transfer curves obtained on the day of fabrication and after 200 days, the drain-source current of the IZO TFT without a passivation layer decreased by approximately 37 %. For the PMMA-passivated IZO TFT, it decreased by approximately 31 %. The current for the CYTOPpassivated IZO TFT showed significantly lower, only 7 % deterioration. Hence, the CYTOP-passivated IZO TFT exhibited improved electrical stability under long term ambient storage. This was attributed to the difference in the chemical composition of the two polymers, as CYTOP is a fluoropolymer, while PMMA is an ester group containing organic polymer. We show, passivation of the active layer with the proper organic film improves the stability of the high-performance solution-processed IZO TFTs.

Room temperature processed protective layer for printed silver electrodes

“…[27][28][29][30] CYTOP has a high carbon-uorine binding energy, so it is ordinarily robust to harsh outdoor conditions, such as heat, UV light, and moisture. [31][32][33][34][35][36] Hence, it has been widely used as an encapsulation material for thin lm devices. Aer the protective layer was cast on the glass, it was dried in ambient conditions (25 °C) for 30 minutes.…”

Solution-Processed Low Resistivity Zinc Oxide Nanoparticle Film with Enhanced Stability Using EVOH

“…This polymer film finds extensive use as a passivation layer in electrical applications, including solar cells, 44,45 supercapacitors, 46 and thin film transistors. 47 EVOH is an environmentally friendly, durable, and a low-toxicity polymer that can be used as a cost-effective gas barrier material. 41−43 The presence of hydroxyl functional groups within its molecular structure enables facile adsorption onto the surface of ZnO NPs.…”

“…Ethylene vinyl alcohol (EVOH), derived from ethylene vinyl acetate (EVA), serves as a widely utilized flexible oxygen barrier in various applications, − including its role as an airtight encapsulant for sensitive electronic materials. This polymer film finds extensive use as a passivation layer in electrical applications, including solar cells, , supercapacitors, and thin film transistors . EVOH is an environmentally friendly, durable, and a low-toxicity polymer that can be used as a cost-effective gas barrier material. − The presence of hydroxyl functional groups within its molecular structure enables facile adsorption onto the surface of ZnO NPs.…”

P‐1.14: Effects of Active Layer Thickness on Performance of InZnO Transistors

“…Oxide semiconductor transistors have attracted considerable attention on flat panel display and integration circuits (ICs) due to their high mobility and excellent uniformity [1]. More and more research groups are focusing on exploreing transistors based on multi-component amorphous oxides, mainly because these materials are potential to achieve high electron mobility, good stability, and low leakage current.…”