Abstract
The progressive stacking of chalcogenide single layers gives rise to two-dimensional semiconducting materials with tunable properties that can be exploited for new field-effect transistors and photonic devices. Yet the properties of some members of the chalcogenide family remain unexplored. Indium selenide (InSe) is attractive for applications due to its direct bandgap in the near infrared, controllable p- and n-type doping and high chemical stability. Here, we reveal the lattice dynamics, optical and electronic properties of atomically thin InSe flakes prepared by micromechanical cleavage. Raman active modes stiffen or soften in the flakes depending on which electronic bonds are excited. A progressive blue-shift of the photoluminescence peaks is observed for decreasing flake thickness (as large as 0.2 eV for three single layers). First-principles calculations predict an even larger increase in the bandgap, 0.40 eV, for three single layers, and as much as 1.1 eV for a single layer. These results are promising from the point of view of the versatility of this material for optoelectronic applications at the nanometer scale and compatible with Si and III-V technologies.
[Figure not available: see fulltext.]
Original language | English |
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Pages (from-to) | 1556-1568 |
Number of pages | 13 |
Journal | Nano Research |
Volume | 7 |
Issue number | 10 |
Early online date | 28 Aug 2014 |
DOIs | |
Publication status | Published - Oct 2014 |
Keywords
- electronic structure
- indium selenide
- micro-photoluminescence
- micro-Raman spectroscopy
- two-dimensional flakes
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Materials Science(all)
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Profiles
-
Brian D. Gerardot
- School of Engineering & Physical Sciences - Professor
- School of Engineering & Physical Sciences, Institute of Photonics and Quantum Sciences - Professor
Person: Academic (Research & Teaching)