High optical sensitivity to ambient conditions of uncapped InGaAs surface quantum dots

Milla Rodrigo, M. J. and Ulloa Herrero, José María and Fernández González, Alvaro de Guzmán (2012). High optical sensitivity to ambient conditions of uncapped InGaAs surface quantum dots. "Applied Physics Letters", v. 100 (n. 13); pp.. ISSN 0003-6951. https://doi.org/10.1063/1.3697992.

Description

Title: High optical sensitivity to ambient conditions of uncapped InGaAs surface quantum dots
Author/s:
  • Milla Rodrigo, M. J.
  • Ulloa Herrero, José María
  • Fernández González, Alvaro de Guzmán
Item Type: Article
Título de Revista/Publicación: Applied Physics Letters
Date: March 2012
ISSN: 0003-6951
Volume: 100
Subjects:
Faculty: Instituto de Sistemas Optoelectrónicos y Microtecnología (ISOM) (UPM)
Department: Ingeniería Electrónica
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The influence of the environment on the optical properties of self-assembled In0.5Ga0.5As surface quantum dots is studied as a function of different ambient conditions for sensing applications. Their room temperature photoluminescence (PL) quenches under vacuum and decreases strongly under dry O2 or N2 environments. Nevertheless, they have a strong signal at 1.55 lm in air or in a wet atmosphere. The presence of water molecules in the environment improves the PL intensity likely due to its polar character and therefore its easier adsorption by the surface dangling bonds, leading to a suppression of the non-radiative recombination centers.

More information

Item ID: 22294
DC Identifier: http://oa.upm.es/22294/
OAI Identifier: oai:oa.upm.es:22294
DOI: 10.1063/1.3697992
Official URL: http://scitation.aip.org/content/aip/journal/apl/100/13/10.1063/1.3697992
Deposited by: Memoria Investigacion
Deposited on: 09 Feb 2014 09:20
Last Modified: 22 Sep 2014 11:30
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