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UV photo-detector based on p-NiO thin film/n-ZnO nanorods heterojunction prepared by a simple process
Shahid Chamran University of Ahvaz, Iran.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
Shahid Chamran University of Ahvaz, Iran.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
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2015 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 632, 165-171 p.Article in journal (Refereed) Published
Abstract [en]

A UV photo-detector based on p-NiO thin film/n-ZnO nanorods heterojunction was fabricated using a simple two-step fabrication process. The aqueous chemical hydrothermal and thermal evaporation methods were combined to grow the ZnO nanorods and the NiO thin film, respectively. Structural investigation indicated that well aligned ZnO nanorods with hexagonal face having a preferential orientation along the c-axis (002) have been achieved and that the NiO thin film is covering all the ZnO nanorods. X-ray photoelectron spectroscopy (XPS) was used to investigate the band alignment of the heterojunction and the valence and the conduction band offsets were determined to be 1.50 eV and 1.83 eV, respectively. The current-voltage characteristics of the p-NiO thin film/ZnO nanorods heterojunction showed a clear rectifying behavior under both dark and UV illumination conditions. The response of the heterojunction diode was excellent regarding the photocurrent generation. Although other similar heterojunction diodes demonstrated lower threshold voltage, the rectification ratio and the sensitivity of the fabricated diode were superior in comparison to other similar heterojunctions reported recently, implying the vitality of the presented two-step process. (C) 2015 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier , 2015. Vol. 632, 165-171 p.
Keyword [en]
ZnO nanorods; NiO thin film; UV photo-detector; Heterojunction
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-116939DOI: 10.1016/j.jallcom.2015.01.155ISI: 000350388900026OAI: oai:DiVA.org:liu-116939DiVA: diva2:802653
Note

Funding Agencies|Linkoping University; Shahid Chamran University of Ahvaz

Available from: 2015-04-13 Created: 2015-04-10 Last updated: 2017-12-04

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Chey, Chan OeurnKhranovskyy, VolodymyrNour, OmerWillander, Magnus

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