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

Mun Bae Jeon, Yeon Hwa Kwak, Byeong Kwon Ju, Kunnyun Kim

Research output: Contribution to journalArticle

1 Citation (Scopus)

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°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 μm and depositing UV sensing layers such as ZnO, Sn/ZnO, and AgNW/ZnO. Among these sensing layers, the frequency response characteristics were found to be improved in the bi-layer structure. In addition, the AgNW/ZnO-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.

Original languageEnglish
Article number112044
JournalSensors and Actuators, A: Physical
Volume311
DOIs
Publication statusPublished - 2020 Aug 15

Keywords

  • Acoustoelectric effect
  • Response characteristics
  • Silver nanowire
  • Surface acoustic wave
  • Ultraviolet
  • Zinc oxide

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

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