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Ultraviolet sensor with fast response characteristics based on an AgNW/ZnO bi-layer

Authors
Jeon, Mun-BaeKwak, Yeon HwaJu, Byeong-KwonKim, Kunnyun
Issue Date
15-8월-2020
Publisher
ELSEVIER SCIENCE SA
Keywords
Surface acoustic wave; Silver nanowire; Zinc oxide; Ultraviolet; Response characteristics; Acoustoelectric effect
Citation
SENSORS AND ACTUATORS A-PHYSICAL, v.311
Indexed
SCIE
SCOPUS
Journal Title
SENSORS AND ACTUATORS A-PHYSICAL
Volume
311
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/53762
DOI
10.1016/j.sna.2020.112044
ISSN
0924-4247
Abstract
We demonstrate an ultraviolet (UV) sensor with fast response characteristics based on an AgNW/ZnO bi-layer. This UV sensor is a surface acoustic wave (SAW)-based sensor fabricated using a 128 degrees YX black lithium niobate substrate, which is a piezoelectric in nature. This sensor, which is a two-port SAW resonator, was manufactured by fabricating interdigitated electrodes with a wavelength of 16.4 mu m and depositing UV sensing layers such as ZnO, Sn/ZnO, and AgNWIZnO. Among these sensing layers, the frequency response characteristics were found to be improved in the bi-layer structure. In addition, the AgNWIZnO-based sensor showed a significant improvement in response and recovery times. These results contributed to rapid oxygen adsorption on the ZnO surface due to the large oxygen contact area that can attributed to the AgNW's 3D mesh structure and the compensation of the internal electron trap center due to the contact of the metal-semiconductor. The proposed sensor with the metal-semiconductor bi-layer structure based on AgNW nanomaterials showed the fastest response characteristics compared to previous SAW UV sensors. (C) 2020 Elsevier B.V. All rights reserved.
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공과대학 (전기전자공학부)
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