Journal
CHEMISTRY OF MATERIALS
Volume 24, Issue 2, Pages 393-401Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm2032866
Keywords
silicon nanocrystals; hydrogen silsesquioxane; HSQ; size determination; small-angle X-ray scattering; SAXS; Scherrer analysis; X-ray diffraction; XRD; transmission electron microscopy; TEM
Funding
- National Science Foundation [0618242]
- Robert A. Welch Foundation [F-1464]
- Natural Science and Engineering Research Council of Canada
- MEXT [3 NIM-08F-001]
- National Science Foundation NNIN [ECCS-0335765]
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We report a chemical route to colloidal silicon (Si) nanocrystals, or quantum dots, with widely tunable average diameter, from less than 3 nm up to 90 nm and peak photoluminescence (PL) from visible wavelengths to the bulk band gap of Si at 1100 nm. The synthesis relies on the high temperature (>1100 degrees C) decomposition of hydrogen silsesquioxane (HSQ) to obtain Si quantum dots with good crystallinity and a narrow size distribution with tunable size embedded in SiO2. The oxide matrix is removed by hydrofluoric acid etching in the dark. Subsequent thermal hydrosilylation with alkenes yields free, solvent-dispersible Si nanocrystals with bright PL. The relationship between PL energy and size, exhaustively characterized by transmission electron microscopy (TEM), small-angle X-ray scattering (SAXS), and X-ray diffraction (XRD), is reported.
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