Electrically Modulated Wavelength-Selective Photodetection Enabled by Mo S2/Zn O Heterostructure

Kumawat, KL and Augustine, P and Singh, DK and Nanda, KK and Krupanidhi, SB (2022) Electrically Modulated Wavelength-Selective Photodetection Enabled by Mo S2/Zn O Heterostructure. In: Physical Review Applied, 17 (6).

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Abstract

Regardless of the significant progress in photodetectors (PDs), most conventional technologies are equipped with optical filters for spectral discrimination, which results in expensive circuitry as well as a high incidence of energy loss. Different from traditional PDs, a MoS2/ZnO heterostructure-based PD is demonstrated that exhibits a bias-dependent switchable spectral response. A low-band-gap MoS2 thin film is vertically stacked on top of a high-band-gap ZnO film that allows selective charge transport from each layer by modulating the applied bias, resulting in a fine discrimination between visible and near-infrared (NIR) light. Under a lower applied bias, a dominant photoresponse in the visible region by the ZnO film is observed, whereas an enhanced response in the NIR region is obtained at higher bias, which is attributed to the generation of charge carriers in the MoS2 region. The excellent figures of merit obtained in the study attest to the high quality of the device, paving the way for fabricating energy-efficient imaging systems free of optical filters. © 2022 American Physical Society.

Item Type:	Journal Article
Publication:	Physical Review Applied
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the American Physical Society.
Keywords:	Energy dissipation; Energy efficiency; Energy gap; II-VI semiconductors; Infrared devices; Layered semiconductors; Metallic films; Molybdenum; Optical filters; Photodetectors; Thin films; Zinc oxide, Applied bias; High incidence; Low band gap; Photo detection; Spectral response; Switchable; Thin-films; Visible and near infrared; Wavelength-selective; ZnO films, Molybdenum compounds
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	28 Jul 2022 05:26
Last Modified:	28 Jul 2022 05:26
URI:	https://eprints.iisc.ac.in/id/eprint/75010

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