Low-Cost Flexible ZnO Microwires Array Ultraviolet Photodetector Embedded in PAVL Substrate

• Published in: Nanoscale research letters Vol. 13; no. 1; pp. 277 - 8
• Main Authors: Sun, Xinyu, Azad, Fahad, Wang, Shuangpeng, Zhao, Lingzhi, Su, Shichen
• Format: Journal Article
• Language: English
• Published: New York Springer US 10.09.2018; Springer Nature B.V; SpringerOpen
• Subjects: Alcohols; Arrays; Bend radius; Bending machines; Chemistry and Materials Science; Dark current; Fabrication; Low cost; Low currents; Materials Science; Molecular Medicine; Nano Express; Nanochemistry; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Photometers; Polyethylene; Polyethylene terephthalate; Polyvinyl alcohol; Response time; Semiconductor devices; Substrates; Ultraviolet detectors; Ultraviolet photodetector; Ultraviolet radiation; Wearable technology; Zinc oxide; ZnO microwire array; ZnO microwire array; Ultraviolet photodetector
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-018-2701-4

With the advent of wearable device technology, fabrication of inorganic semiconductor devices on flexible organic substrates is of great interest. In this paper, a fascinating method and a low-cost flexible substrate material polyvinyl alcohol (PVAL) have been utilized to embed ZnO microwire (MW) array to produce ultraviolet (UV) photodetector (PD) with decent photoresponsivity. The flexible PVAL substrate is relatively cheap and has better bendability as compared to polyethylene terephthalate (PET) and other traditional flexible substrate materials, which makes it unique in comparison to traditional devices. The device shows a current photoresponsivity of 29.6 A/W in the UV spectral range (350 to 380 nm) and maintains an excellent detection performance with even a bending angle of 180°. In dark, a low current of 1.4 μA at 5 V bias and response time of 4.27 ms was observed. In addition to the excellent device performance at wide bending angles, the fabricated device also performs well with the bending radii close to 0. Therefore, ZnO MW array PD has a great potential for the real-time monitoring of harmful UV exposure to warn the users for the appropriate arrangement avoidance.