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Structural and optical properties of ge nanocrystals embedded in Al2O3
P Caldelas1, A G Rolo, A Chahboun
1Centre of Physics, University of Minho, 4710-057 Braga, Portugal.
Abstract:
Ge nanocrystals (NCs) embedded in aluminum oxide were grown by RF-magnetron sputtering. Raman, high resolution transmission electron microscopy (HRTEM), selected area diffraction (SAD), and X-ray diffraction (XRD) techniques confirmed good cristallinity of the NCs from samples annealed at 800 degrees C. The average NC size was estimated to be around 7 nm. Photoluminescence (PL) measurements show an emission related to the NCs. The temperature dependence of the PL confirms the confinement phenomenon in the Ge NCs.
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