Dependence of Surface InGaAs Quantum Dot Luminescence on the Molecular Properties of the Environment

The photoluminescence (PL) of self-assembled In 0.5 Ga 0.5 As surface quantum dots is studied as a function of different species present in a controlled atmosphere. The presence of oxygen-containing molecules on the surface leads to a correlation of the PL intensity with the polarity and molecular m...

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Bibliographic Details
Published in:Applied physics express 2013-09, Vol.6 (9), p.092002-092002-4
Main Authors: Milla, María José, Ulloa, José María, Guzmán, Álvaro
Format: Article
Language:English
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Summary:The photoluminescence (PL) of self-assembled In 0.5 Ga 0.5 As surface quantum dots is studied as a function of different species present in a controlled atmosphere. The presence of oxygen-containing molecules on the surface leads to a correlation of the PL intensity with the polarity and molecular mass of the species. Such molecules are more easily adsorbed, giving rise to a reduction of the number of nonradiative recombination centers and, therefore, to an enhanced PL of the dots. The strong dependence of the signal emission on the ambient conditions makes these nanostructures very promising for the development of sensing devices.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.6.092002