ZnO nanowires-based flexible UV photodetector system for wearable dosimetry

Carlos García Núñez, Anastasios Vilouras, William Taube Navaraj, Fengyuan Liu, Ravinder Dahiya

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Abstract

This paper presents a flexible ultraviolet (UV) photodetector (PD) system based on zinc oxide (ZnO) nanowires (NWs) for wearable UV dosimetry. High-crystal quality ZnO NWs have been synthesized by chemical vapour transport (CVT) technique on c-plane sapphire substrates, and thereafter, transferred and aligned at pre-defined locations on a flexible substrate using dielectrophoresis (DEP). The accurate control over DEP parameters permitted the fabrication of large-area (wafer scale) arrays of ZnO NWs based UV PDs. Resulting PDs showed photocurrent-to-dark current ratios above 103 %, fast response times (<1 s), high sensitivity to different UV light intensities, and good stability under several UV/dark irradiation cycles. In addition, above PDs presented a robust response under extreme bending conditions, which is critical for their application in high-performance wearable UV dosimeters
Original languageEnglish
Pages (from-to)7881-7888
Number of pages8
JournalIEEE Sensors Journal
Volume18
Issue number19
Early online date11 Jul 2018
DOIs
Publication statusE-pub ahead of print - 11 Jul 2018
Externally publishedYes

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Keywords

  • ZnO nanowires
  • UV photodetectors
  • Wearable Electronics
  • Optoelectronics
  • Dielectrophoresis
  • Nanowire Assembly

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