High responsivity, self-powered carbon–zinc oxide hybrid thin film based photodetector

Ahmad, Harith and Thandavan, Tamil Many K. (2018) High responsivity, self-powered carbon–zinc oxide hybrid thin film based photodetector. Applied Nanoscience, 8 (7). pp. 1755-1765. ISSN 2190-5509

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Official URL: https://doi.org/10.1007/s13204-018-0842-5

Abstract

A self-powered n-Si/C–ZnO/SiO2/p-Si heterojunction photodetector (PD) which comprises of carbon (C) and zinc oxide (ZnO) nanostructures on a n-type silicon (n-Si) substrate was prepared via vapor phase transport method. Excellent photodetection under 468 nm light illumination for powers ranging from 2.78 to 2910 µW delivered a quick response of about 9.5 µs. A high photoresponsivity of 2.082/AW and external quantum efficiency about 551% were obtained. The mechanism involved for the generation of a photocurrent at a zero bias voltage was discussed for future energy efficient optoelectronics devices. The morphology and composition of C, Zn and O were confirmed by field emission scanning electron microscope, energy dispersive X-ray and Raman scattering analysis. The formation of ZnO nanowires range from 10 to 100 nm, aided by the photoconduction mechanism. The Raman E2 high mode of 437/cm of ZnO and the presence of D and G bands show the formation of a hybrid C–ZnO thin film. The calculated rectifying ratio is found to shift as the direct current bias voltage and light power increased. The deposition of C particles on the ZnO surface creates point defects and sub-energy levels in the ZnO bandgap which favour fast responsivity in the PD.

Item Type: Article
Uncontrolled Keywords: Carbon; Photodetector; Responsivity; Self-powered; 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 02:52
Last Modified: 07 Oct 2019 02:52
URI: http://eprints.um.edu.my/id/eprint/22674

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