Enhancement of electrical characteristics and stability of self-patterned In–Zn–O thin-film transistors based on photosensitive precursors

Abstract

We report a novel self-patterning method for solution-processed indium zinc oxide (IZO) thin films based on photosensitive precursors. This approach is an alternative and evolutionary approach to the traditional photoresist patterning techniques. Chelate bonds between metal ions and β-diketone compounds in ultraviolet light-exposed IZO solutions provided intrinsic photosensitivity, which resulted in a solubility difference between exposed and non-exposed regions. This difference enabled self-patterning of the IZO for thin-film transistor (TFT) fabrication. Compared with previously reported self-patterning methods based on photosensitive activators, our self-patterned IZO TFTs based on photosensitive precursors displayed excellent electrical characteristics and stability. The field-effect mobility increased from 0.27 to 0.99 cm2/Vs, the subthreshold swing decreased from 0.54 to 0.46 V/dec, and the threshold voltage shift under a positive bias stress test (1,000 s) improved from 9.32 to 1.68 V. The photosensitive precursor played a key role in these improvements permitting fewer organic species which act as defect sites after metal oxide formation. Consequently, our approach compares favorably with that of conventional fabrication process using photoresist in terms of its simplicity, cost efficiency, and electrical performance.

Preparation and comparison of electrospunPEO/PTFEandPVA/PTFEnanofiber membranes for syringe filters

“…BTCA was directly added into the spinning solution with sodium hypophosphite monohydrate as a catalyst in ratio of 2:1 (w/w) and stirred further 15 min. BTCA is generally used for crosslinking purposes via esterification 32,33 at about 150–180°C. It also enhances the conductivity of the PVA solution, thus improves the spinnability of the polymer solution.…”

Electrochemical Sensing Based on Nanofibers Modified Electrodes for Application in Diagnostic, Food and Waste Water Samples

“…The PVA/BTCA/β-CD/GOD/AuNPs NF hydrogel patch sensor was able to detect Glc in a wide linear range with a fast response. [20] Carbon-based electrospun NFs are the most commonly used composite materials for (bio)sensor applications due to their excellent electrical and mechanical properties. They serve as electron conducting materials and reinforced support structures for a new generation of wearable biosensors.…”

“…biosensors using NFs modified electrodes are listed in Table S1. [14][15][16][17][18][19][20][21][22] From this table, it can be seen that the use of a suitable NFs composite and thus the choice of NFs composite components plays a significant role in the performance of the GOD-based biosensor. For example, the use of biocompatible polymers in combination with metal and metal oxide NP or carbon nanostructures such as GO and MWCNT not only leads to excellent electrical and mechanical properties, but also increases the specific surface area, the loading of more enzymes and accordingly its catalytic activity.…”

A Comprehensive Review on Printed Electronics: A Technology Drift towards a Sustainable Future

“…Zinc oxide nanoparticles exhibit unique properties suitable for optoelectronics, photovoltaics, electronics, and various sensing applications [ 38 ]. IZO ink exhibits semiconducting nature making it desirable as a thin film transistor [ 39 ]. Iron oxide-based metallic ink is highly magnetic ink with good electrical properties [ 40 ].…”