Journal
IEEE SENSORS JOURNAL
Volume 18, Issue 19, Pages 7881-7888Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2018.2853762
Keywords
ZnO nanowires; UV photodetectors; wearable electronics; optoelectronics; dielectrophoresis; nanowire assembly
Funding
- Engineering and Physical Sciences Research Council through the Engineering Fellowship for Growth-PRINTSKIN [EP/M002527/1]
- Centre for Doctoral Training in Intelligent Sensing and Measurement [EP/L016753/1]
- James Watt Nanofabrication Centre
- Electronic Systems Design Centre
- EPSRC [EP/R029644/1, EP/M002527/1] Funding Source: UKRI
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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 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 10(3)%, 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.
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