Quantum confinement and photoresponsivity of β-In2Se3 nanosheets grown by physical vapour transport

Balakrishnan, Nilanthy and Staddon, Christopher R. and Smith, Emily F. and Stec, Jakub and Gay, Dean and Mudd, Garry W. and Makarovsky, Oleg and Kudrynskyi, Zakhar R. and Kovalyuk, Zakhar D. and Eaves, Laurence and Patanè, Amalia and Beton, Peter H. (2016) Quantum confinement and photoresponsivity of β-In2Se3 nanosheets grown by physical vapour transport. 2D Materials . ISSN 2053-1583 (In Press)

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Abstract

We demonstrate that β-In2Se3 layers with thickness ranging from 2.8 – 100 nm can be grown on SiO2/Si, mica and graphite using a physical vapour transport method. The β-In2Se3 layers are chemically stable at room temperature and exhibit a blue-shift of the photoluminescence emission when the layer thickness is reduced, due to strong quantum confinement of carriers by the physical boundaries of the material. The layers are characterized using Raman spectroscopy and X-ray diffraction from which we confirm lattice constants c = 28.31±0.05 Å and a = 3.99±0.02 Å. In addition, these layers show high photoresponsivity of up to ~ 2×103 A/W at λ = 633 nm, with rise and decay times of τr = 0.6 ms and τd = 2.5 ms, respectively, confirming the potential of the as-grown layers for high sensitivity, fast photodetectors.

Item Type: Article
Keywords: In2Se3; van der Waals layered crystals; 2D materials; quantum confinement; physical vapour transport
Schools/Departments: University of Nottingham UK Campus > Faculty of Science > School of Chemistry
University of Nottingham UK Campus > Faculty of Science > School of Physics and Astronomy
Depositing User: Eprints, Support
Date Deposited: 21 May 2016 15:37
Last Modified: 14 Sep 2016 10:38
URI: http://eprints.nottingham.ac.uk/id/eprint/33256

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