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Applied Nanoscience

, Volume 8, Issue 7, pp 1755–1765 | Cite as

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

  • H. Ahmad
  • T. Tamil
Original Article
  • 19 Downloads

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 E2high 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.

Keywords

Self-powered Photodetector Carbon Zinc oxide Responsivity 

Notes

Acknowledgements

Funding for this work was provided for by the Ministry of Higher Education, Malaysia under the Grants LRGS (2015) NGOD/UM/KPT and GA 010-2014 (ULUNG) as well as the University of Malaya under the Grants RU 001-2017.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Photonics Research Centre, Faculty of ScienceUniversity of MalayaKuala LumpurMalaysia
  2. 2.Department of Physics, Faculty of Science and TechnologyAirlangga UniversitySurabayaIndonesia

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