Vapour phase nucleation of ZnO nanowires on GaN: growth habit, interface study and optical properties

Year: 2016

Authors: Baratto C., Ferroni M., Comini E., Faglia G., Kaciulis, Balijepalli S.K., Sberveglieri G.

Autors Affiliation: CNR INO, Sensor Lab, Via Branze 45, I-25133 Brescia, Italy; Univ Brescia, Dept Informat Engn, Sensor Lab, Via Branze 38, I-25133 Brescia, Italy; CNR ISMN, POB 10, I-00015 Rome, Monterotondo St, Italy.

Abstract: In the current work aligned ZnO nanowires were grown on p-GaN thin films for optoelectronic applications, using a vapour phase technique in a tubular furnace. To investigate the growth of ZnO nanowires at the interface with GaN, the heterojunction were characterized by scanning electron microscopy and X-ray photoelectron spectroscopy. Experimental evidence indicates that the Au catalyst remains at the interface between ZnO and GaN, and that interdiffusion of GaN into ZnO occurs. Concerning the ZnO growth, it starts with Vapour Liquid Solid (VLS) growth from Au catalyzer nanoparticles, then lateral growth takes place making nanowalls. After this initial stage, the nanowires both continue growth by VLS and start growing via a Vapour-Solid (VS) mechanism from the nanowalls. To investigate the potential of the heterostructure of ZnO nanowires on GaN as a light emitting diode, the device was also analysed by current-voltage characterization, photoluminescence and electroluminescence spectroscopy.

Journal/Review: RSC ADVANCES

Volume: 6 (18)      Pages from: 15087  to: 15093

More Information: The research leading to these results has received funding from the European Communities 7th Framework Programme under grant agreement NMP3-LA-2010-246334 ORAMA (Oxide Materials Towards a Matured Post-silicon Electronics Era). Financial support of the European Commission is therefore gratefully acknowledged. The research project “WIROX” Oxide Nanostructures for Wireless Chemical Sensing, PEOPLE MARIE CURIE ACTIONS, International Research Staff Exchange Scheme PIRSES-GA-2011-295216, Call: FP7-PEOPLE-2011-IRSES, 2012-2015 is also acknowledged. In addition the authors thank OSRAM Opto-Semiconductors for providing the GaN templates within the ORAMA project.
KeyWords: LIGHT-EMITTING DIODE; SENSING APPLICATIONS; METAL-OXIDES; THIN-FILMS; P-GAN; PHOTOLUMINESCENCE; ELECTROLUMINESCENCE; LUMINESCENCE; ULTRAVIOLET; EMISSION
DOI: 10.1039/c5ra25019f

Citations: 6
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