Heterojunction photodetector based on graphene oxide sandwiched between ITO and p-Si

Ahmad, Harith and Tajdidzadeh, Mojgan and Thandavan, Tamil Many K. (2018) Heterojunction photodetector based on graphene oxide sandwiched between ITO and p-Si. Journal of Modern Optics, 65 (3). pp. 353-360. ISSN 0950-0340, DOI https://doi.org/10.1080/09500340.2017.1397224.

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Official URL: https://doi.org/10.1080/09500340.2017.1397224


The drop casting method is utilized on indium tin oxide (ITO)-coated glass in order to prepare a sandwiched ITO/graphene oxide (ITO/GO) with silicon dioxide/p-type silicon (SiO2/p-Si) heterojunction photodetector. The partially sandwiched GO layer with SiO2/p-Si substrate exhibits dual characteristics as it showed good sensitivity towards the illumination of infrared (IR) laser at wavelength of 974 nm. Excellent photoconduction is also observed for current–voltage (I–V) characteristics at various laser powers. An external quantum efficiency greater than 1 for a direct current bias voltage of 0 and 3 V reveals significant photoresponsivity of the photodetector at various laser frequency modulation at 1, 5 and 9 Hz. The rise times are found to be 75, 72 and 70 μs for 1, 5 and 9 Hz while high fall times 455, 448 and 426 are measured for the respective frequency modulation. The fabricated ITO/GO-SiO2/p-Si sandwiched heterojunction photodetector can be considered as a good candidate for applications in the IR regions that do not require a high-speed response.

Item Type: Article
Funders: Grant number LRGS (2015) NGOD/UM/KPT, GA010-2014 (ULUNG) and RU001/2017 from the University of Malaya (UM)
Uncontrolled Keywords: Graphene oxide; ITO glass; p-type silicon; heterojunction; sandwiched photodetectors
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 00:48
Last Modified: 07 Oct 2019 00:48
URI: http://eprints.um.edu.my/id/eprint/22658

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