Influence of Halides on the Optical Properties of Silicon Quantum Dots

Creators: Dasog, Mita; Bader, Kathrin; Veinot, Jonathan G. C.

Abstract

Silicon quantum dots (Si-QDs) have received substantial attention over the last two decades owing to their abundance, biocompatibility, and optical properties. Similar to their group II−VI and III−V quantum dot counterparts, hydride-terminated Si-QDs with diameters smaller than 5 nm can exhibit size-dependent photoluminescence (PL) in the visible spectral region. However, the hydride surface is highly susceptible to oxidation and requires further modification to passivate it and render the QDs soluble in common solvents.

Additional Information

© 2015 American Chemical Society. Received: January 12, 2015; Revised: February 4, 2015; Published: February 4, 2015. The authors acknowledge continued generous funding from the National Engineering Research Council of Canada (NSERC). M.D. thanks Alberta Innovates Technology Futures, Killam Trusts, and NSERC for scholarships. We also thank W. C. Moffat and G. Kaufmann for assistance with FTIR and Raman spectroscopy, respectively. The staff at the Alberta Centre for Surface Engineering and Sciences (ACSES) is thanked for XPS analysis. K. Cui at the National Institute of Nanotechnology (NINT) and T. Purkait are thanked for TEM analysis. G. de los Reyes is thanked for assistance with lifetime measurements. N. S. Lewis, R. Snitynsky, and N. Plymale are thanked for useful discussion.

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Supplemental Material - cm5b00115_si_001.pdf

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