Planar hybrid carbon-decorated zinc oxide nanowires for infrared photodetection

Ahmad, Harith and Thandavan, Tamil Many K. (2018) Planar hybrid carbon-decorated zinc oxide nanowires for infrared photodetection. Journal of Nanoparticle Research, 20 (4). p. 96. ISSN 1388-0764, DOI

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Vapor phase transport (VPT) assisted by thermal evaporation of methanol was utilized to favor the fabrication of hybrid carbon-decorated zinc oxide nanowires (C/ZnO NWs). The photoluminescence (PL) spectrum revealed evidence of optical properties for several defects such as zinc interstitials (Zni) and oxygen vacancy (Vo) in hybrid C/ZnO NWs. The PL also exhibited that the planar hybrid C/ZnO NWs photodetector has a wide range of sensitivity from ultraviolet (UV) to infrared (IR). The imaging results show formation of ZnO nanostructures which can be further confirmed from X-ray diffraction (XRD) results. XRD exhibits carbon (C)-related peaks at 12.88, 26, 43, 45, and 55° together with standard ZnO peaks. The incorporation of C shows excellent photoconduction towards varied laser powers (0.0, 7.82, 37.95, 69.20, 100.0, 130.0, and 160.0 mW) of IR illumination. The possibility of current drain in the device was evaluated based on the direct-current (DC) bias voltage of 0.00, 3.33, and 5.55 V. DC bias 3.33 and 5.55 V attributed increase of photocurrent towards the forward bias voltage. However, the reverse bias voltage illustrated a vast increase of photocurrent compared to the forward bias voltage. External quantum efficiency (EQE) at DC bias 5.55 V was 6.5–9.5 range folds greater than the EQE measured for zero bias voltage. Significant photoresponsivity was identical for various laser pulse ranging from 10 to 5000 Hz. Simultaneously, the rise (τr) and fall (τf) time were measured at 49 and 60.5 μs attributes that the fabrication technique can be improvised and implemented to enhance the efficiency of optoelectronic devices for future applications.

Item Type: Article
Funders: Ministry of Higher Education (MOHE): under the grant LRGS (2015) NGOD/UM/KPT, University of Malaya under the grants RP 029A–15 AFR and RU001/2017
Uncontrolled Keywords: Carbon; Hybrid; Nanowire; Photodetectors; Photoluminescence; Sensors; Zinc oxide
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Photonics Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 07 Oct 2019 01:47
Last Modified: 07 Oct 2019 01:47

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