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Morphology controlled synthesis of low bandgap SnSe 2 with high photodetectivity

Rai, RK and Islam, S and Roy, A and Agrawal, G and Singh, AK and Ghosh, A and Ravishankar, N (2019) Morphology controlled synthesis of low bandgap SnSe 2 with high photodetectivity. In: Nanoscale, 11 (3). pp. 870-877.

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Official URL: https://doi.org/10.1039/c8nr08138g


Engineering the properties of layered metal dichalcogenides (LMDs) requires stringent control of their morphology. Herein, using a scalable one-step solvothermal technique, we report the synthesis of SnSe2 under two different conditions, leading to the formation of nanoflakes and nanoflowers. The use of oleic acid in the reaction leads to the formation of nanoflowers, and the presence of ethanol in the reaction medium leads to the formation of nanoflakes. Ab initio density functional theory calculations rationalise this observation, revealing a stronger adsorption of ethanol on the {0001} facet compared to the acid. Furthermore, these SnSe2 nanoflakes, when integrated with graphene, also respond to incident electromagnetic radiation, from the visible to near infrared regime, with a specific detectivity of ∼5 × 1010 Jones, which is comparable to that of the best available photodetectors, making them suitable for use in various technological applications.

Item Type: Journal Article
Publication: Nanoscale
Publisher: Royal Society of Chemistry
Additional Information: The copyright for this article belongs to Royal Society of Chemistry.
Keywords: Calculations; Density functional theory; Electromagnetic waves; Ethanol; Infrared devices; Nanoflowers; Selenium compounds, Ab initio density functional theories (DFT); Adsorption of ethanol; Dichalcogenides; Morphology-controlled; Reaction medium; Solvothermal techniques; Specific detectivity; Technological applications, Tin compounds
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 28 Nov 2022 09:24
Last Modified: 28 Nov 2022 09:24
URI: https://eprints.iisc.ac.in/id/eprint/78085

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