Yoon, Jongwon Bae, Ga-Young Yoo, Seonggwang Yoo, Jung Il You, Nam-Ho Hong, Woong-Ki Ko, Heung Cho 2024-01-19T18:02:11Z 2024-01-19T18:02:11Z 2022-01-25 2020-03 0925-8388 https://pubs.kist.re.kr/handle/201004/118881 Recently, deep-ultraviolet (DUV) photodetectors with useful functions including transparency and flexibility have been developed for a real-time environmental monitoring, a wearable monitoring system, transparent wireless communication, and a smart window system. In this study, we investigate the DUV sensing characteristics of transparent and flexible IGZO thin-film transistors (TFTs) fabricated by a dry transfer printing, which is a very promising technique affording the device fabrication on unconventional surfaces. The fabricated TFT devices show high mechanical stability even at a bending radius of 1.4 mm, and the repeatable and gate bias-dependent DUV photoresponse characteristics. The gate bias-dependent photocurrent (I-ph) decay characteristics are likely attributed to the different surface re-adsorption rates of oxygen molecules depending on the gate bias polarity, which are qualitatively described based on energy band diagrams. In addition, the wavelength-dependent photoresponse characteristics of the IGZO TFT device upon UV illumination with lambda= 245 nm show a 10 times faster I-ph decay behavior than that upon UV illumination with lambda=365 nm. The result implies that the dissociative oxygen arising from the DUV illumination could accelerate the I-ph decay due to the increased surface adsorption. (C) 2019 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA Deep-ultraviolet sensing characteristics of transparent and flexible IGZO thin film transistors Article 10.1016/j.jallcom.2019.152788 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.817 JOURNAL OF ALLOYS AND COMPOUNDS 817 N scie scopus 000506166400030 2-s2.0-85074457893 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article OXIDE DEVICE IGZO thin film transistors Deep-UV sensing Transparent and flexible electronics Transfer printing Surface effects