Self-Organized Three-Dimensional Nanostructured Architectures in Bulk GaN Generated by Spatial Modulation of Doping.

Tiginyanu, I., Stevens-Kalceff, M. A., Sarua, A., Braniste, T., Monaico, E., Popa, V., Andrade, H. D., Thomas, J. O., Raevschi, S., Schulte, K. and Adelung, Rainer (2016) Self-Organized Three-Dimensional Nanostructured Architectures in Bulk GaN Generated by Spatial Modulation of Doping. Ecs Journal of Solid State Science and Technology, 5 (5). P218-P227. DOI 10.1149/2.0091605jss.

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Self-organized 3D nanostructured architectures including quasi-ordered concentric hexagonal structures generated during the growth of single crystalline n-GaN substrates by hydride vapor phase epitaxy (HVPE) are reported. The study of as-grown samples by using Kelvin Probe Force Microscopy shows that the formation of self-organized architectures can be attributed to fine modulation of doping related to the spatial distribution of impurities. The specific features of nanostructured architectures involved have been brought to light by using electrochemical and photoelectrochemical etching techniques which are highly sensitive to local doping. The analysis of the results shows that the formation of self-organized spatial architectures in the process of HVPE is caused by the generation of V-pits and their subsequent overgrowth accompanied by the growth in variable direction. It is demonstrated for the first time that the electrical and luminescence properties of HVPE-grown GaN are spatially modulated throughout, including islands between overgrown V-pit regions. The dependence of doping upon growth direction is confirmed by the micro-cathodoluminescence characterization of HVPE-grown pencil-like microcrystals exposing various crystallographic planes along the tip. These results are indicative of new possibilities for defect engineering in gallium nitride and for three-dimensional spatial nanostructuring of this important electronic material by controlling the growth direction. (C) 2016 The Electrochemical Society. All rights reserved.

Document Type: Article
Additional Information: Times Cited: 1 Tiginyanu, Ion Stevens-Kalceff, Marion A. Sarua, Andrei Braniste, Tudor Monaico, Eduard Popa, Veaceslav Andrade, Hugo D. Thomas, James O. Raevschi, Simion Schulte, Karl Adelung, Rainer
Keywords: cathodoluminescence microscopy and spectroscopy, defect Engineering, electrochemical and photoelectrochemical etching, GaN nanostructuring, Kelvin probe force microscopy
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1149/2.0091605jss
ISSN: 2162-8769
Projects: Future Ocean
Date Deposited: 16 Mar 2017 08:34
Last Modified: 23 May 2019 12:05

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