1. Optical study of the band structure of wurtzite GaP nanowires.
- Author
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Assali, S., Greil, J., Zardo, I., Belabbes, A., de Moor, M. W. A., Koelling, S., Koenraad, P. M., Bechstedt, F., Bakkers, E. P. A. M., and Haverkort, J. E. M.
- Subjects
OPTICAL properties of gallium phosphide ,WURTZITE ,SYNTHESIS of nanowires ,CONDUCTION bands ,ELECTRONIC band structure ,PHOTOLUMINESCENCE - Abstract
We investigated the optical properties of wurtzite (WZ) GaP nanowires by performing photoluminescence (PL) and time-resolved PL measurements in the temperature range from 4K to 300 K, together with atom probe tomography to identify residual impurities in the nanowires. At low temperature, the WZ GaP luminescence shows donor-acceptor pair emission at 2.115 eV and 2.088 eV, and Burstein-Moss band-filling continuum between 2.180 and 2.253 eV, resulting in a direct band gap above 2.170 eV. Sharp exciton α-β-γ lines are observed at 2.140-2.164-2.252 eV, respectively, showing clear differences in lifetime, presence of phonon replicas, and temperaturedependence. The excitonic nature of those peaks is critically discussed, leading to a direct band gap of ~2.190 eV and to a resonant state associated with the c-line ~80 meV above the Γ
8C conduction band edge. [ABSTRACT FROM AUTHOR]- Published
- 2016
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