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Quenching of Si nanocrystal photoluminescence



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ARTICLE IN PRESS Journal of Luminescence 114 2005 137 144 www elsevier com locate jlumin Quenching of Si nanocrystal photoluminescence by doping with gold or phosphorous Anna L Tchebotarevaa Michiel J A de Dooda Julie S Biteenb Harry A Atwaterb Albert Polmana b a FOM Institute for Atomic and Molecular Physics Kruislaan 407 1098 SJ Amsterdam The Netherlands b California Institute of Technology 1200 E California Blvd Pasadena CA 91125 USA Received 15 April 2004 received in revised form 10 November 2004 accepted 20 December 2004 Available online 19 February 2005 Abstract Si nanocrystals embedded in SiO2 doped with P and Au at concentrations in the range of 1 1018 3 1020 cm 3 exhibit photoluminescence quenching Upon increasing the Au concentration a gradual decrease in nanocrystal photoluminescence intensity is observed Using a statistical model for luminescence quenching we derive a typical radius of 3 nm for nanocrystals luminescing around 800 nm Au doping also leads to a luminescence lifetime reduction which is attributed to energy transfer between adjacent Si nanocrystals possibly mediated by the presence of Au in the form of ions or nanocrystals Doping with P at concentrations up to 3 1019 cm 3 leads to a luminescence enhancement most likely due to passivation of the nanocrystal SiO2 interfaces Upon further P doping the nanocrystal luminescence gradually decreases with little change in luminescence lifetime r 2005 Elsevier B V All rights reserved PACS 78 67 Bf 78 67 Hc 68 55 Ln Keywords Photoluminescence Quenching 1 Introduction During the last decade a large amount of research was devoted to the creation of alternative Corresponding author Tel 31 20 608 1234 fax 31 20 608 4106 E mail address a tchebotareva amolf nl A L Tchebotareva methods of obtaining an ef cient light source based on silicon It was found that Si quantum dots emit light at visible and near infrared wavelengths This luminescence was rst observed in porous silicon 1 2 a material that consists of a



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