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Controlled Passivation and Luminescence Blue Shifts of Isolated Silicon Nanocrystals

Published online by Cambridge University Press:  10 February 2011

Julie S. Biteen ,
Anna L. Tchebotareva ,
Albert Polman ,
Nathan S. Lewis  and
Harry A. Atwater
Julie S. Biteen
Affiliation:
California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 2
Anna L. Tchebotareva
Affiliation:
FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
Albert Polman
Affiliation:
California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 2 FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
Nathan S. Lewis
Affiliation:
California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 2
Harry A. Atwater
Affiliation:
California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 2
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Abstract

We have performed a comparative study of oxide- and nonoxide-passivated silicon nanocrystals to probe the role of the silicon/oxygen interface in low coverage, non-interacting silicon nanocrystal systems. Ensembles of Si nanocrystals characterized by a narrow distribution and diameters of 2–5 nm were synthesized by ion implantation into SiO2 films followed by a high-temperature anneal in Ar. The nanocrystals were removed from the SiO2 film matrix and deposited on Si substrates using a chemical etch in HF, leaving a hydrogen-terminated surface. A natural oxide layer grows on these surfaces in air. We characterized the morphology of the samples with atomic force microscopy (AFM) and the spectroscopic properties with photoluminescence (PL) and X-Ray photoelectron spectroscopy. We found that the PL energy of Si nanocrystals can be shifted by particle size reduction and hydrogen or oxygen termination. Further, PL peak energy shifts upon etching and oxidation were consistent with the model of Wolkin et al. that proposes that for very small radii, a silicon-oxygen double bond will produce deep interface states which red shift the luminescence.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 770: Symposium I – Optoelectronics of Group-IV-Based Materials , 2003 , I6.2
Copyright
Copyright © Materials Research Society 2003

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