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Ion beam synthesis and carrier dynamics of ZnO nanoparticles embedded in a SiO2 matrix

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Abstract

Zinc oxide (ZnO) nanostructures have been synthesized by the implantation of ZnO molecular ions into SiO2 followed by high temperature thermal annealing. 35 keV ZnO− ions were implanted to a fluence of 5×1016 ions/cm2 into SiO2 at room temperature (RT). The implanted sample was annealed in an oxygen environment to allow the growth of ZnO precipitates. In the as-implanted sample, Zn nanoparticles up to 4.5 nm in diameter were observed and were distributed throughout the implanted depth in the SiO2. The highest concentration of Zn from the implantation was at a depth of 25 nm. During annealing, Zn diffused into the substrate and combined with oxygen to form ZnO. ZnO nanostructures thus formed had diameters up to 8 nm, embedded in SiO2. Donor-bound exciton (D, X), acceptor-bound exciton (A, X), and donor–acceptor-pair (DAP) transitions were observed in low temperature photoluminescence (PL) measurements on an annealed sample. RT-PL measurement showed band-edge emission in the ultraviolet region with a full width at half maximum of 121 meV. Time-resolved PL measurements performed at 4 K revealed an excitonic lifetime of 160 ps.

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Acknowledgements

This work was supported in part by a grant from the Center for Advanced Research at the University of North Texas, which made possible the XPS and HRTEM measurements.

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  1. Department of Physics, University of North Texas, Denton, USA

    B. Pandey, P. R. Poudel, A. K. Singh, A. Neogi & D. L. Weathers

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  1. B. Pandey
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  2. P. R. Poudel
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  3. A. K. Singh
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  4. A. Neogi
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  5. D. L. Weathers
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Correspondence to B. Pandey.

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Pandey, B., Poudel, P.R., Singh, A.K. et al. Ion beam synthesis and carrier dynamics of ZnO nanoparticles embedded in a SiO2 matrix. Appl. Phys. A 112, 801–806 (2013). https://doi.org/10.1007/s00339-013-7692-5

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  • DOI: https://doi.org/10.1007/s00339-013-7692-5

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