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Growth of non-polar (11-20) InGaN quantum dots by metal organic vapour phase epitaxy using a two temperature method


Type

Article

Change log

Authors

Griffiths, JT 
Oehler, F 
Emery, RM 
Fu, WY 

Abstract

jats:pNon-polar (11-20) InGaN quantum dots (QDs) were grown by metal organic vapour phase epitaxy. An InGaN epilayer was grown and subjected to a temperature ramp in a nitrogen and ammonia environment before the growth of the GaN capping layer. Uncapped structures with and without the temperature ramp were grown for reference and imaged by atomic force microscopy. Micro-photoluminescence studies reveal the presence of resolution limited peaks with a linewidth of less than ∼500 μeV at 4.2 K. This linewidth is significantly narrower than that of non-polar InGaN quantum dots grown by alternate methods and may be indicative of reduced spectral diffusion. Time resolved photoluminescence studies reveal a mono-exponential exciton decay with a lifetime of 533 ps at 2.70 eV. The excitonic lifetime is more than an order of magnitude shorter than that for previously studied polar quantum dots and suggests the suppression of the internal electric field. Cathodoluminescence studies show the spatial distribution of the quantum dots and resolution limited spectral peaks at 18 K.</jats:p>

Description

Keywords

Quantum dots, Cathodoluminescence, Linewidths, Photoluminescence, Atomic force microscopy

Journal Title

APL Materials

Conference Name

Journal ISSN

2166-532X
2166-532X

Volume Title

2

Publisher

AIP Publishing
Sponsorship
Engineering and Physical Sciences Research Council (EP/H019324/1)
Engineering and Physical Sciences Research Council (EP/I012591/1)
Engineering and Physical Sciences Research Council (EP/J003603/1)
Engineering and Physical Sciences Research Council (EP/H047816/1)
This work was funded by the EPSRC (Grant Nos. EP/J003603/1 and EP/H047816/1).