Coupling heterostructure of thickness-controlled nickel oxide nanosheets layer and titanium dioxide nanorod arrays via immersion route for self-powered solid-state ultraviolet photosensor applications

• Published in: Measurement: Journal of the International Measurement Confederation
• Main Author: Yusoff M.M.; Mamat M.H.; Abdullah M.A.R.; Ismail A.S.; Malek M.F.; Zoolfakar A.S.; Al Junid S.A.M.; Suriani A.B.; Mohamed A.; Ahmad M.K.; Shameem Banu I.B.; Rusop M.
• Format: Article
• Language: English
• Published: Elsevier B.V. 2020
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85071537075&doi=10.1016%2fj.measurement.2019.106982&partnerID=40&md5=e2790a979e414c3f086b6d20c2816e3d

A coupling heterostructure consisting of nickel oxide nanosheets (NNS) and titanium dioxide nanorod arrays (TNAs) was fabricated for self-powered solid-state ultraviolet (UV) photosensor applications. By controlling the thickness of the NNS layer by via varying the growth time from 1 to 5 h at a deposition temperature of 90 °C, the coupling NNS/TNAs heterojunction films were formed and their structural, optical, electrical and UV photoresponse properties were investigated. The photocurrent measured from the fabricated self-powered UV photosensor was improved by increasing the thickness of NNS from 140 to 170 nm under UV irradiation (365 nm, 750 µWcm−2) at 0 V bias. A maximum photocurrent density of 0.510 µA∙cm−2 was achieved for a sample with a NNS thickness of 170 nm and prepared with a 3 h NNS growth time. Our results showed that the fabricated NNS/TNAs heterojunction has potential applications for self-powered UV photosensors. © 2019 Elsevier Ltd