Fabrication and Optical Properties of Strain-free Self-assembled Mesoscopic GaAs Structures

Author(s)

Covre da Silva, Saimon Filipe ; Mardegan, Thayna ; de Araujo, Sidnei Ramis ; Ospina Ramirez, Carlos Alberto ; Kiravittaya, Suwit ; Couto, Jr., Odilon D. D. ; Iikawa, Fernando ; Deneke, Christoph

• Document type: Journal article
• Source: NANOSCALE RESEARCH LETTERS; v. 12, JAN 21 2017.
• Web of Science Citations: 1

Abstract

We use a combined process of Ga-assisted deoxidation and local droplet etching to fabricate unstrained mesoscopic GaAs/AlGaAs structures exhibiting a high shape anisotropy with a length up to 1.2 mu m and a width of 150 nm. We demonstrate good controllability over size and morphology of the mesoscopic structures by tuning the growth parameters. Our growth method yields structures, which are coupled to a surrounding quantum well and present unique optical emission features. Microscopic and optical analysis of single structures allows us to demonstrate that single structure emission originates from two different confinement regions, which are spectrally separated and show sharp excitonic lines. Photoluminescence is detected up to room temperature making the structures the ideal candidates for strain-free light emitting/detecting devices. (AU)

• FAPESP's process: 14/17141-9 - Multi-User Equipment approved in grant 2012/11382-9: (iHR550) spectrometer with ICCD (SII-3LS-256-BR)-Horiba
• Grantee: Odilon Divino Damasceno Couto Júnior
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 16/14001-7 - Growth and fabrication of semiconductor nanomembrane structures for basic research and potential device applications
• Grantee: Christoph Friedrich Deneke
• Support Opportunities: Regular Research Grants
• FAPESP's process: 12/11382-9 - Optical modulation of semiconductor nanostructures using surface acoustic waves
• Grantee: Odilon Divino Damasceno Couto Júnior
• Support Opportunities: Research Grants - Young Investigators Grants