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Fabrication and Characterization of Silicon Quantum Dots in Si-Rich Silicon Carbide Films

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Abstract:

Amorphous Si-rich silicon carbide films were prepared by magnetron co-sputtering and subsequently annealed at 900–1100 °C. After annealing at 1100 °C, this configuration of silicon quantum dots embedded in amorphous silicon carbide formed. X-ray photoelectron spectroscopy was used to study the chemical modulation of the films. The formation and orientation of silicon quantum dots were characterized by glancing angle X-ray diffraction, which shows that the ratio of silicon and carbon significantly influences the species of quantum dots. High-resolution transmission electron microscopy investigations directly demonstrated that the formation of silicon quantum dots is heavily dependent on the annealing temperatures and the ratio of silicon and carbide. Only the temperature of about 1100 °C is enough for the formation of high-density and small-size silicon quantum dots due to phase separation and thermal crystallization. Deconvolution of the first order Raman spectra shows the existence of a lower frequency peak in the range 500–505 cm−1corresponding to silicon quantum dots with different atom ratio of silicon and carbon.

Keywords: HRTEM; RAMAN SHIFT; SILICON CARBIDE FILMS; SILICON QUANTUM DOTS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.4025

Publication date: December 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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