Crystallographically uniform arrays of ordered (In)GaN nanocolumns
Open Access
- 15 January 2015
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 117 (3)
- https://doi.org/10.1063/1.4905951
Abstract
In this work, through a comparative study of self-assembled (SA) and selective area grown (SAG) (In)GaN nanocolumn (NC) ensembles, we first give a detailed insight into improved crystallographic uniformity (homogeneity of crystallographic tilts and twists) of the latter ones. The study, performed making use of: reflective high energy electron diffraction, X-ray diffraction and scanning electron microscopy, reveals that unlike their SA counterparts, the ensembles of SAG NCs show single epitaxial relationship to both sapphire(0001) and Si(111) underlying substrates. In the second part of the article, making use of X-ray diffraction, we directly show that the selective area growth leads to improved compositional uniformity of InGaN NC ensembles. This further leads to improved spectral purity of their luminescence, as confirmed by comparative macro-photoluminescence measurements performed on SA and SAG InGaN NC ensembles. An improved crystallographic uniformity of NC ensembles facilitates their integration into optoelectronic devices, whereas their improved compositional uniformity allows for their employment in single-color optoelectronic applications.Keywords
Funding Information
- Comunidad Autonoma de Madrid (CAM/P2009/ESP-1503)
- EU FP7 GECCO (280694-2)
- Ministerio de ciencia e Innovación de España (MAT2011-26703)
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