Projects per year
Abstract
Layered indium selenides (In2Se3) have recently been discovered to host robust out-of-plane and in-plane ferroelectricity in the α- and β′-phases, respectively. In this work, we utilize angle-resolved photoelectron spectroscopy to directly measure the electronic band structure of β′In2Se3 and compare to hybrid density functional theory (DFT) calculations. In agreement with DFT, we find the band structure is highly two-dimensional, with negligible dispersion along the c-axis. Because of n-type doping we can observe the conduction band minima and directly measure the minimum indirect (0.97 eV) and direct (1.46 eV) bandgaps. We find the Fermi surface in the conduction band is characterized by anisotropic electron pockets with sharp in-plane dispersion about the M points, yielding effective masses of 0.21m0 along KM and 0.33m0 along ΓM. The measured band structure is well supported by hybrid density functional theory calculations. The highly two-dimensional (2D) band structure with moderate bandgap and small effective mass suggests that β′-In2Se3 is a potentially useful van der Waals semiconductor. This, together with its ferroelectricity makes it a viable material for high-mobility ferroelectric−photovoltaic devices, with applications in nonvolatile memory switching and renewable energy technologies.
Original language | English |
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Pages (from-to) | 213-219 |
Number of pages | 7 |
Journal | ACS Applied Electronic Materials |
Volume | 2 |
Issue number | 1 |
DOIs | |
Publication status | Published - 28 Jan 2020 |
Keywords
- ARPES
- Electronic band structure
- Ferroelectric
- Indium selenide
- Infrared bandgap
- Optoelectronics
- Van der Waals
Projects
- 3 Finished
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ARC Centre of Excellence in Future Low-energy Electronics Technologies
Fuhrer, M., Bao, Q., Culcer, D., Davis, M., Davis, J. A., Hamilton, A., Helmerson, K., Klochan, O., Medhekar, N., Ostrovskaya, E. A., Parish, M., Schiffrin, A., Seidel, J., Sushkov, O., Valanoor, N., Wang, X., Galitskiy, V., Gurarie, V., Hannon, J., Höfling, S., Hone, J., Rule, K. C., Krausz, F., Littlewood, P., MacDonald, A., Neto, A., Oezyilmaz, B., Paglione, J., Phillips, W., Spielman, I., Tadich, A., Xue, Q., Cole, J., Perali, A., Neilson, D., Sek, G., Gaston, N., Hodgkiss, J. M., Tang, M., Karel, J., Nguyen, T., Adam, S., Granville, S., Kumar, P. & Daeneke, T.
Australian Research Council (ARC), Monash University – Internal School Contribution, Monash University – Internal Department Contribution, Monash University – Internal Faculty Contribution, Monash University – Internal University Contribution, University of Wollongong, University of Queensland , Tsinghua University, University of New South Wales (UNSW), Australian National University (ANU), RMIT University, Swinburne University of Technology
29/06/17 → 28/06/24
Project: Research
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Realisation of novel electronic phases in two-dimensional materials
Australian Research Council (ARC)
17/06/16 → 31/12/19
Project: Research
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Understanding and Controlling the Properties of Dirac Electronic Materials
Australian Research Council (ARC)
14/01/13 → 30/09/18
Project: Research
Equipment
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Australian Synchrotron
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility