Abstract
The optical, structural, and vibrational properties of self-assembled GaN nanorods (NRs) were systematically examined to help understand the impact of residual strains on their emission properties. The GaN NRs grown at temperatures less than 550 °C displayed line-defects along the a-axis, which are responsible for the residual compressive strain in the GaN NRs. The residual compressive strain, which depends on the growth temperature, gave rise to a blue-shift of the effective optical band-gap. Compared to the GaN thin films, the influence of residual strains on the blue-shift were more than 3-times greater for GaN NRs. This implies that growth interruptions to control the growth temperatures and/or source fluxes would be more critical in the fabrication of GaN-NR-based light-emitting devices.
Original language | English |
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Pages (from-to) | 518-522 |
Number of pages | 5 |
Journal | Journal of the Korean Physical Society |
Volume | 62 |
Issue number | 3 |
DOIs | |
State | Published - 2013 |
Keywords
- Cathodoluminescence
- GaN
- Nanorod
- Photoluminescence
- Strain effect