High-performance flexible ZnO nanorod UV photodetectors with a network-structured Cu nanowire electrode
Abstract
In this work, vertically aligned zinc oxide (ZnO) nanorod (NR)-based flexible ultraviolet (UV) photodetectors were successfully fabricated on a polyimide (PI) substrate with a copper (Cu) nanowire (NW) electrode. To enhance the flexibility and sensing properties, the entangled networks of Cu NWs were applied to UV photodetectors as a flexible electrode. Here, Cu NWs have a high conductivity with a low cost compared to other metals to achieve a Schottky contact with ZnO NRs. Moreover, because of forming a network structure, the surface of the sensing material has a large contact area with oxygen molecules, resulting in a faster response time. The Cu NW electrode exhibited a high optical transmittance of 90%, a considerable sheet resistance of 50 Ω sq−1, and a work function of 5.12 eV. Consequentially, the fabricated UV photodetector with Cu NW electrodes showed excellent UV sensing properties with a very fast rising time of 0.7 s and a decay time of 1.9 s in the dark and under UV illumination (365 nm, 0.40 mW cm−2) at a reverse bias of −2.0 V. Furthermore, during the bending test at a radius of curvature of 5 mm, the flexible ZnO NR UV photodetectors with Cu NW electrodes exhibited almost unchanged UV sensing properties even after 5000 cycles.
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For wearable photodetectors, various materials such as crumpled graphene-AuNPs, ZnO nanostructures, rGO/PVDF-TrFE nanocomposites, MoS2/WS2 heterojunction arrays, Zn2SnO4 NWs, and SnO2 NWs were employed for detection of UV, IR, or other light illumination, based on the principle that light illumination can excite more electrons into the conduction band generating photocurrent.
“For wearable photodetectors, various materials such as crumpled graphene-AuNPs, [177] ZnO nanostructures, [82,178,179] rGO/ PVDF-TrFE nanocomposites, [180] MoS 2 /WS 2 heterojunction arrays, [181] Zn 2 SnO 4 NWs, [182] SnO 2 NWs [31,183] were employed for the detection of UV, [31,82,178,179,182,183] infrared (IR), [180] or other light illumination, [177,181] based on the principle that light”
From Nanomaterial-Enabled Wearable Sensors for Healthcare (2018) · cites this paper as [179]
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Nanomaterial-Enabled Wearable Sensors for Healthcare
Yao, S., Swetha, P., & Zhu, Y. (2018) · Advanced Healthcare Materials · doi:10.1002/adhm.201700889 · Cited by 576 · see citing works
- Authors
- Kwon, D.-K., Lee, S. J., & Myoung, J.-M.
- Affiliations
- Yonsei University (KR)
- Corresponding author
- Myoung, Jae-Min
- Venue
- Nanoscale
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2016
- Volume
- 8
- Issue
- 37
- Pages
- 16677-16683
- ISSN
- 2040-3364 (ISSN-L)
- 2040-3372
- OpenAlex
- W2507255570
- Cited by
- 61
- References
- 46
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 8 · 2023: 3 · 2021: 9 · 2020: 5 · 2019: 11 · 2018: 8 · 2017: 11 · 2016: 1
- FWCI
- 4.60
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Nanoscale (publishedVersion)
- PubMed (publishedVersion)
- Funders
- RIKEN
- Topics
- Physical Sciences › Materials Science › Materials Chemistry › ZnO doping and properties
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Nanomaterials and Printing Technologies
- Physical Sciences › Engineering › Biomedical Engineering › Advanced Sensor and Energy Harvesting Materials
- Keywords
- ZnO nanorods, ultraviolet photodetectors, flexible electronics, polyimide substrate, Schottky contacts, optical transmittance, sheet resistance, work function, bending stability, response time (sensor)
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