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Reactions and luminescence in passivated Si nanocrystallites induced by vacuum ultraviolet and soft-x-ray photons.

Chao, Y. and Krishnamurthy, S. and Montalti, M. and Lie, L.H. and Houlton, A. and Horrocks, B.R. and Kjeldgaard, L. and Dhanak, V.R. and Hunt, M.R.C. and Šiller, L. (2005) 'Reactions and luminescence in passivated Si nanocrystallites induced by vacuum ultraviolet and soft-x-ray photons.', Journal of applied physics., 98 (4). 044316.


Alkyl-modified siliconnanocrystallites are efficient fluorophores which are of interest for fundamental spectroscopic studies and as luminescent probes in biology because of their stability in aqueous media. In this work we have investigated these particles using scanning tunneling microscopy, synchrotron-radiation excited photoemission, and x-ray excited optical luminescence (XEOL). During the course of illumination with 145-eVphotons we have monitored the evolution of the Si2p core level and, in samples which have suffered prolonged atmospheric exposure, observed in real time the growth of an extra Si2p component attributed to in situ photoinduced oxidation of the Si nanocrystallites. XEOL reveals that two emission bands are active upon soft-x-ray photon excitation and that photoluminescence intensity decreases with photon exposure, which is attributed to charge trapping within the film.

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Publisher statement:© 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics 98, 044316 (2005) and may be found at
Date accepted:07 July 2005
Date deposited:19 August 2015
Date of first online publication:August 2005
Date first made open access:No date available

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