Selective area growth of GaN nano islands by metal organic chemical vapor deposition: Experiments and computer simulations

Anilkumar Chandolu, Gela D. Kipshidze, Sergey A. Nikishin, Tian Lu, Daoying Song, Mark Holtz, Anya Lobanova

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

We report the properties of GaN islands selectively grown by MOCVD on (0001) GaN/sapphire templates and on bare (0001) sapphire substrates. The approach allows us to grow GaN crystals with control over size and density through optical (micro-scale) and scanning electron microscope (SEM) e-beam (nano-scale) lithography. We have obtained complete pyramidal and prismatic hexagonal GaN islands. The growth characteristics are found to be very different from what we obtain for epitaxial layers, an effect which is attributed to loading and surface diffusion of source materials on the hard mask. From the dependence of growth rate of the pyramids with pitch we evaluate Ga surface diffusion length of ∼ 10 urn over SiO2 mask. We present a growth model based on diffusion and compare the results of modeling with our data. Using micro-Raman spectroscopy the stress in pyramidal and prismatic islands was evaluated to be 50 ± 17 MPa and 84 ± 20 MPa, respectively. This implies that the islands are nearly relaxed compared to similar thickness of uniform layers. Room temperature SEM cathodoluminescence (CL) shows a narrow linewidth consistent with high quality of GaN layers. The GaN islands, of varying shapes, were overgrown with InGaN multiple quantum wells, with optical properties measured using SEM-CL.

Original languageEnglish
Title of host publicationAdvances in III-V Nitride Semiconductor Materials and Devices
PublisherMaterials Research Society
Pages150-155
Number of pages6
ISBN (Print)9781604234114
DOIs
StatePublished - 2006
Event2006 MRS Fall Meeting - Boston, MA, United States
Duration: Nov 27 2006Dec 1 2006

Publication series

NameMaterials Research Society Symposium Proceedings
Volume955
ISSN (Print)0272-9172

Conference

Conference2006 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period11/27/0612/1/06

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    Chandolu, A., Kipshidze, G. D., Nikishin, S. A., Lu, T., Song, D., Holtz, M., & Lobanova, A. (2006). Selective area growth of GaN nano islands by metal organic chemical vapor deposition: Experiments and computer simulations. In Advances in III-V Nitride Semiconductor Materials and Devices (pp. 150-155). (Materials Research Society Symposium Proceedings; Vol. 955). Materials Research Society. https://doi.org/10.1557/proc-0955-i07-14