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Silicon nanocrystal synthesis by implantation of natural Si isotopes

Barba, D, Koshel, D, Martin, F, Ross, GG, Chicoine, M, Schiettekatte, F, Yedji, M, Demarche, J and Terwagne, G (2010) Silicon nanocrystal synthesis by implantation of natural Si isotopes Journal of Luminescence, 130 (4). pp. 669-673.

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Implantations of pure 28Si+, 29Si+, and 30Si+ into SiO2 can provide significant insight into the formation of silicon nanocrystals (Si-nc) and their light emission properties. Si-nc produced with different fractions of the heavier Si isotopes have been characterized by Raman and photoluminescence spectroscopy. Weak Stokes shifts of the Si-nc phonon peaks indicate that both the implanted Si and the native Si from the SiO2 substrate contribute to Si-nc nucleation. The Raman measurements also indicate that the Si isotopic composition of the Si-nc is similar to the Si isotopic fraction of the implanted SiO2. The Si-nc photoluminescence (PL) spectra are shifted towards the blue with increasing Si isotope mass, an indication that the increase of the Si-nc effective mass enhances the excitonic bandgap. Measurements from samples implanted with heavy isotopes at high Si excess concentrations indicate that the Si-nc isotope fraction evolves with annealing time such that the heaviest Si isotope are more concentrated in the vicinity of the Si-nc / SiO2 interface, which can modify the energy states involved in the radiative transitions associated with Si-nc. © 2009 Elsevier B.V. All rights reserved.

Item Type: Article
Divisions : Surrey research (other units)
Authors :
Barba, D
Koshel, D
Martin, F
Ross, GG
Chicoine, M
Schiettekatte, F
Yedji, M
Terwagne, G
Date : 1 April 2010
DOI : 10.1016/j.jlumin.2009.11.014
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:05
Last Modified : 24 Jan 2020 23:24

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