Quantum confinement and photoresponsivity ofβ-In2Se3 nanosheets grown by physical vapour transport
| Autor: | Nilanthy Balakrishnan, Christopher R Staddon, Emily F Smith, Jakub Stec, Dean Gay, Garry W Mudd, Oleg Makarovsky, Zakhar R Kudrynskyi, Zakhar D Kovalyuk, Laurence Eaves, Amalia Patanè, Peter H Beton |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Photoluminescence Mechanical Engineering Analytical chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences symbols.namesake Lattice constant Mechanics of Materials Chemical physics Quantum dot X-ray crystallography symbols General Materials Science Mica 0210 nano-technology Luminescence Spectroscopy Raman spectroscopy QC |
| Zdroj: | 2D Materials |
| ISSN: | 2053-1583 0953-8984 0022-3727 |
| Popis: | We demonstrate that β-In2Se3 layers with thickness ranging from 2.8 to 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 characterised 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−1 at λ = 633 nm, with rise and decay times of τ r = 0.6 ms and τ d = 2.5 ms, respectively, confirming the potential of the as-grown layers for high sensitivity photodetectors. |
| Databáze: | OpenAIRE |
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