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Light emission from the layered metal 2H-TaSe2 and its potential applications

Mahajan, M and Kallatt, S and Dandu, M and Sharma, N and Gupta, S and Majumdar, K (2019) Light emission from the layered metal 2H-TaSe2 and its potential applications. In: Communications Physics, 2 (1).

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Official URL: https://doi.org/10.1038/s42005-019-0190-0


Conventional metals, in general, do not exhibit strong photoluminescence. 2H-TaSe2 is a layered transition metal dichalcogenide that possesses metallic property with charge density wave characteristics. Here we show that 2H-TaSe2 exhibits a surprisingly strong optical absorption and photoluminescence resulting from inter-band transitions. We use this perfect combination of electrical and optical properties in several optoelectronic applications. We show a sevenfold enhancement in the photoluminescence intensity of otherwise weakly luminescent multi-layer MoS2 through non-radiative resonant energy transfer from TaSe2 transition dipoles. Using a combination of scanning photocurrent and time-resolved photoluminescence measurements, we also show that the hot electrons generated by light absorption in TaSe2 have a rather long lifetime unlike conventional metals, making TaSe2 an excellent hot electron injector. Finally, we show a vertical TaSe2/MoS2/graphene photodetector demonstrating a responsivity of >10 AW−1 at 0.1 MHz—one of the fastest reported photodetectors using MoS2.

Item Type: Journal Article
Publication: Communications Physics
Publisher: Nature Research
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Charge density; Charge density waves; Energy transfer; Hot electrons; Layered semiconductors; Light absorption; Molybdenum compounds; Optical properties; Photodetectors; Photoluminescence; Photons; Selenium compounds; Semiconductor quantum wells; Tantalum compounds; Transition metals, Absorption and photoluminescence; Electrical and optical properties; Inter-band transition; Optoelectronic applications; Photoluminescence intensities; Resonant energy transfer; Time-resolved photoluminescence; Transition metal dichalcogenides, Sulfur compounds
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 12 Oct 2022 09:26
Last Modified: 12 Oct 2022 09:26
URI: https://eprints.iisc.ac.in/id/eprint/77404

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