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Journal of Nanotechnology
Volume 2012 (2012), Article ID 635705, 6 pages
http://dx.doi.org/10.1155/2012/635705
Research Article

A Combined Ion Implantation/Nanosecond Laser Irradiation Approach towards Si Nanostructures Doping

1Dipartimento di Fisica e Astronomia, Università di Catania, via S. Sofia 64, 95123 Catania, Italy
2MATIS, CNR, IMM, via S. Sofia 64, 95123 Catania, Italy
3Istituto per la Microelettronica e Microsistemi (CNR)-(IMM)—Consiglio Nazionale delle Ricerche VIII Strada 5, 95121 Catania, Italy
4Dipartimento di Fisica “A.Volta,” Università degli Studi di Pavia, via Bassi 6, 27100 Pavia, Italy

Received 28 September 2011; Accepted 23 November 2011

Academic Editor: Arturo I. Martinez

Copyright © 2012 F. Ruffino et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The exploitation of Si nanostructures for electronic and optoelectronic devices depends on their electronic doping. We investigate a methodology for As doping of Si nanostructures taking advantages of ion beam implantation and nanosecond laser irradiation melting dynamics. We illustrate the behaviour of As when it is confined, by the implantation technique, in a SiO2/Si/SiO2 multilayer and its spatial redistribution after annealing processes. As accumulation at the Si/SiO2 interfaces was observed by Rutherford backscattering spectrometry in agreement with a model that assumes a traps distribution in the Si in the first 2-3 nm above the SiO2/Si interfaces. A concentration of 1014 traps/cm2 has been evaluated. This result opens perspectives for As doping of Si nanoclusters embedded in SiO2 since a Si nanocluster of radius 1 nm embedded in SiO2 should trap 13 As atoms at the interface. In order to promote the As incorporation in the nanoclusters for an effective doping, an approach based on ion implantation and nanosecond laser irradiation was investigated. Si nanoclusters were produced in SiO2 layer. After As ion implantation and nanosecond laser irradiation, spectroscopic ellipsometry measurements show nanoclusters optical properties consistent with their effective doping.