Tungsten-disulphide-based heterojunction photodetector

Ahmad, Harith and Rashid, Haroon and Ismail, Mohammad Faizal and Thambiratnam, Kavintheran (2019) Tungsten-disulphide-based heterojunction photodetector. Applied Optics, 58 (15). pp. 4014-4019. ISSN 1559-128X, DOI https://doi.org/10.1364/AO.58.004014.

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Official URL: https://doi.org/10.1364/AO.58.004014


Two-dimensional (2D) materials have realized significant new applications in photonics, electronics, and optoelectronics. Among these materials is tungsten disulphide (WS2), which is a 2D material that shows excellent optoelectronic properties, tunable/sizable bandgap in the visible range, and good absorption. A polycrystalline WS2 thin film is successfully deposited on a substrate using radio frequency magnetron sputtering at room temperature. The x-ray diffraction pattern reveals two hexagonal structured peaks along the (100) and (110) planes. Energy-dispersive x-ray spectroscopy reveals a non-stoichiometric WS2 film with 1.25 ratio of S/W for a 156.3 nm thick film, while Raman shifts are observed at the E1 2g and A1g phonon modes located at 350.70 cm−1 and 415.60 cm−1, respectively. A sandwiched heterojunction photodetector device is successfully fabricated and illuminated within the violet range at 441 nm and 10 V of bias voltage. The maximum photocurrent values are calculated as 0.95 μA, while the responsivity is observed at 169.3 mA W−1 and detectivity 1.48 × 108 Jones at illuminated power of 0.6124 μm. These results highlight the adaptability of the present technique for large-scale applications as well as the flexibility to promote development of advanced optoelectronic devices. © 2019 Optical Society of America.

Item Type: Article
Uncontrolled Keywords: Energy dispersive spectroscopy; Heterojunctions; Magnetron sputtering; Optoelectronic devices; Photodetectors; Photons; Sulfur compounds; Thick films; Thin films
Subjects: Q Science > QC Physics
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Photonics Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 19 May 2020 02:40
Last Modified: 19 May 2020 02:40
URI: http://eprints.um.edu.my/id/eprint/24340

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