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 language | English |
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Pages (from-to) | 7881-7888 |
Number of pages | 8 |
Journal | IEEE Sensors Journal |
Volume | 18 |
Issue number | 19 |
Early online date | 11 Jul 2018 |
DOIs | |
Publication status | E-pub ahead of print - 11 Jul 2018 |
Externally published | Yes |
Keywords
- ZnO nanowires
- UV photodetectors
- Wearable Electronics
- Optoelectronics
- Dielectrophoresis
- Nanowire Assembly