In islands and their conversion to InAs quantum dots on GaAs (100): structural and optical properties

A.J. Urbanczyk, G.J. Hamhuis, R. Nötzel

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We report growth of crystalline In islands on GaAs (100) by molecular beam epitaxy at low temperatures. The islands have a pyramidlike shape with well defined facets and epitaxial relation with the substrate. They are of nanoscale dimensions with high density. Above a certain substrate temperature, associated with the melting point of In, noncrystalline round shaped islands form with larger size and lower density. Upon conversion of the In islands into InAs islands under As flux, the final shape does not depend on the original crystalline state but on the annealing temperature of the InAs islands. Clear photoluminescence is observed from InAs quantum dots after conversion of the crystalline In islands.
Original languageEnglish
Article number014312
Pages (from-to)014312-1/4
Number of pages4
JournalJournal of Applied Physics
Volume107
Issue number1
DOIs
Publication statusPublished - 2010

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