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Nitrogen flux induced GaN nanostructure nucleation at misfit dislocations on Al2O3

Research output: Contribution to journalJournal article

Published

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Journal publication date4/10/2011
JournalApplied Physics Letters
Journal number14
Volume99
Number of pages4
Original languageEnglish

Abstract

The work demonstrates the dominant role of nitrogen flux rate on GaN nanostructure formation on bare Al2O3(0001). In nitrogen rich conditions, wurtzite c-oriented GaN nanowall honeycomb network is formed as strain relaxation pathway of nucleation at edge dislocations. A specific nitrogen flux rate in a plasma assisted molecular beam epitaxy growth is necessary for fixed Ga flux and substrate temperature to form columnar self assembled nanostructures. It is argued that kinetically hindering diffusion of Ga adatoms and the low sticking coefficient of r and m planes of nanowalls promote 1-dimension nanocolumn formation at screw dislocations formed at the GaN-Sapphire interface.