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Optical spectroscopy of Er doped Si-nanocrystals on sapphire substrates fabricated by ion implantation into SiO2

Hylton, NP, Crowe, IF, Knights, AP, Halsall, MP, Ruffell, S and Gwilliam, RM (2010) Optical spectroscopy of Er doped Si-nanocrystals on sapphire substrates fabricated by ion implantation into SiO2 In: Silicon Photonics V, 2010-01-24 - 2010-01-27, San Francisco, USA.

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We present the results of an optical investigation of a series of Er doped silicon nanocrystal (Si-NC) samples which were fabricated via ion implantation into SiO2 on sapphire substrates, followed by a range of rapid thermal processing. The photoluminescence spectra of the Si-NC emission revealed an increase in luminescence intensity and a red-shift of the peak wavelength as a function of annealing conditions. We attribute the former effect to the reduction of implantation induced defects with increasing annealing temperature/duration. Measurements of the rate of decay of photoluminescence intensity at room temperature show a corresponding increase in the carrier lifetimes which is also an indication of a reduced contribution from non-radiative centers. The red-shift of the peak Si-NC intensity is ascribed to an increasing mean Si-NC size as a function of the annealing conditions. Also presented is an estimation of the relative Er sensitization which reveals that the smallest Si-NC size distribution leads to the greatest sensitization ratio. Further investigation in the form of excitation spectroscopy was used to show that Er ions are sensitized not only by energy transfer from the Si-NCs, but also, crucially, from defect states in the SiO2.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Authors :
Date : 2010
Identification Number : 10.1117/12.852922
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 11:18
Last Modified : 17 May 2017 14:55

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