Porous silicon optical microcavity for chemical sensing application using tris-(8-hydroxyquinoline) aluminum (Alq3)
Laboratoire de Photovoltaïque, Semiconducteurs et Nanostructures, Centre de Recherche et des Technologies de l'Énergie, BP 95, Hammam-Lif, 2050, Tunisia
2 Laboratoire de Valorisation des Ressources Naturelles et des Matériaux de Récuperation, Centre National de Recherche en Science des Matériaux, BP 95, Hammam-Lif, 2050, Tunisia
Corresponding author: firstname.lastname@example.org
Accepted: 14 June 2010
Published online: 2 August 2010
The present paper reports the study of a porous silicon based microcavity for a potential chemical sensing application using tris-(8-hydroxyquinoline) aluminum (Alq3) molecules. Porous silicon based planar microcavity was first designed and fabricated using the electrochemical etching technique. Photoluminescence emission of a single porous silicon layer after immersion in an Alq3 solution was first carried out in order to verify that the Alq3 molecules were bound to the porous surface. A wide green band centered at 519 nm, typical of a nano-structured Alq3 film, was observed. Reflectivity measurements of the porous silicon microcavity were then performed for different aluminum concentrations of the Alq3 solution. The microcavity device showed a good sensibility for the Alq3 molecules and an important shift of the microcavity photonic resonance was observed. This device might be considered for a potential aluminiun sensing application.
© EDP Sciences, 2010