Air-stable full-visible-spectrum emission from silicon nanocrystals synthesized by an all-gas-phase plasma approach

X. D. Pi, R. W. Liptak, J. Deneen Nowak, N. P. Wells, C. B. Carter, S. A. Campbell, U. Kortshagen

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121 Scopus citations

Abstract

A novel dual-plasma system has been developed to combine the synthesis of silicon nanocrystals (Si-NCs), the etching to controllably tailor the Si-NC size, and the surface functionalization of Si-NCs into one simple all-gas-phase process. Si-NCs are synthesized in SiH4-based plasma; they then travel through CF4-based plasma, where Si-NCs are etched and passivated by C and F. The resulting Si-NCs exhibit air-stable emission across the full visible spectrum. Structural and optical characterization indicates that the emission in the red-to-green range is based on the recombination of quantum-confined excitons in Si-NCs, while the blue emission originates from defect states. The quantum yields of stabilized photoluminescence from Si-NCs range from 16% at the red end to 1% at the blue end.

Original languageEnglish (US)
Article number245603
JournalNanotechnology
Volume19
Issue number24
DOIs
StatePublished - Jun 18 2008

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