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Structural and Optical Properties of Al2O3 with Si and Ge Nanocrystals

Published online by Cambridge University Press:  01 February 2011

Selcuk Yerci
Affiliation:
syerci@metu.edu.tr, Middle East Technical University, Physics, Fizik Bolumu Z-29, ODTU, Ankara, 06531, Turkey, 0090 312 210 4314, 0090 312 210 5099
Ilker Yildiz
Affiliation:
iyildiz@metu.edu.tr, Middle East Technical University, Department of Physics, Ankara, 06531, Turkey
Ayse Seyhan
Affiliation:
aseyhan@metu.edu.tr, Middle East Technical University, Department of Physics, Ankara, 06531, Turkey
Mustafa Kulakci
Affiliation:
e110665@metu.edu.tr, Middle East Technical University, Department of Physics, Ankara, 06531, Turkey
Ugur Serincan
Affiliation:
userincan@anadolu.edu.tr, Anadolu University, Department of Physics, Eskisehir, 26470, Turkey
Michael Shandalov
Affiliation:
michash@bgu.ac.il, Ben-Gurion University of the Negev, Department of Materials Engineering, Beer-Sheva, 84105, Israel
Yuval Golan
Affiliation:
ygolan@bgu.ac.il, Ben-Gurion University of the Negev, Department of Materials Engineering, Beer-Sheva, 84105, Israel
Rasit Turan
Affiliation:
turanr@metu.edu.tr, Middle East Technical University, Department of Physics, Ankara, 06531, Turkey
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Abstract

Si and Ge nanocrystals were formed in alumina matrix by ion implantation and subsequent annealing. The phase separation of the Si nanocrystals was observed using X-ray photoelectron spectroscopy by monitoring Si 2p electrons. During nanocrystal formation with a high temperature annealing Si0 signals corresponding to Si nanoclusters increases while Si4+ signals related to a-SiO2 disappears from the spectrum. The transition from amorphous to nanocrystalline phase for both Si and Ge nanoclusters and the compressive stress exerted on the formed nanocrystals were also studied by Raman spectroscopy. Photoluminescence spectra of the Al2O3 containing nanocrystals were discussed by means of Ti and Cr impurities, as well as F centers. The existence of the amorphous Ge nanoclusters in alumina matrix significantly enhances the light emission of Ti3+ impurities.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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