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Band gap expansion, shear inversion phase change behaviour and low-voltage induced crystal oscillation in low-dimensional tin selenide crystals
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Carter, Robin, Suyetin, Mikhail, Lister, Samantha, Dyson, Mark Adam, Trewhitt, Harrison, Goel, Sanam, Liu, Zheng, Suenaga, Kazu, Giusca, Cristina, Kashtiban, Reza J., Hutchison, John L., Dore, John C., Bell, Gavin R., Bichoutskaia, Elena and Sloan, Jeremy (2014) Band gap expansion, shear inversion phase change behaviour and low-voltage induced crystal oscillation in low-dimensional tin selenide crystals. Dalton Transactions, Volume 43 (Number 20). pp. 7391-7399. doi:10.1039/c4dt00185k ISSN 1477-9226.
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Official URL: http://dx.doi.org/10.1039/c4dt00185k
Abstract
In common with rocksalt-type alkali halide phases and also semiconductors such as GeTe and SnTe, SnSe forms all-surface two atom-thick low dimensional crystals when encapsulated within single walled nanotubes (SWNTs) with diameters below [similar]1.4 nm. Whereas previous density functional theory (DFT) studies indicate that optimised low-dimensional trigonal HgTe changes from a semi-metal to a semi-conductor, low-dimensional SnSe crystals typically undergo band-gap expansion. In slightly wider diameter SWNTs ([similar]1.4–1.6 nm), we observe that three atom thick low dimensional SnSe crystals undergo a previously unobserved form of a shear inversion phase change resulting in two discrete strain states in a section of curved nanotube. Under low-voltage (i.e. 80–100 kV) imaging conditions in a transmission electron microscope, encapsulated SnSe crystals undergo longitudinal and rotational oscillations, possibly as a result of the increase in the inelastic scattering cross-section of the sample at those voltages.
| Item Type: | Journal Article | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
| Journal or Publication Title: | Dalton Transactions | ||||||||||
| Publisher: | Royal Society of Chemistry | ||||||||||
| ISSN: | 1477-9226 | ||||||||||
| Official Date: | 28 May 2014 | ||||||||||
| Dates: |
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| Volume: | Volume 43 | ||||||||||
| Number: | Number 20 | ||||||||||
| Page Range: | pp. 7391-7399 | ||||||||||
| DOI: | 10.1039/c4dt00185k | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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