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Optimal surface functionalization of silicon quantum dots.

Q S Li1, R Q Zhang, S T Lee

  • 1Centre of Super-Diamond and Advanced Films (COSDAF) and Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, People's Republic of China.

The Journal of Chemical Physics
|July 8, 2008
PubMed
Summary

Surface functionalization of silicon quantum dots (SiQDs) impacts their optical properties. Different termination groups alter SiQD spectra, with sulfur coverage offering tunable optical characteristics for device applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Computational Chemistry

Background:

  • Surface functionalization is crucial for silicon quantum dots (SiQDs) in biological applications.
  • Understanding how different surface groups affect SiQD optical properties is essential for sensor and probe development.

Purpose of the Study:

  • To investigate the influence of various termination groups on the optical properties of SiQDs.
  • To explore the potential for tuning SiQD optical characteristics through surface modification.

Main Methods:

  • Density-functional tight-binding (DFTB) calculations were employed.
  • Systematic investigation of SiQDs with H, CH(3), NH(2), SH, and OH termination groups.

Main Results:

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  • Alkyl (-Si-C-) capping minimally altered optical spectra.
  • NH(2), SH, and OH groups caused significant changes compared to hydrogenated SiQDs.
  • Structural and electronic property changes due to passivation explain observed optical features.
  • Sulfur (S) coverage on SiQD surfaces demonstrated a tunable effect on optical properties.

    • Conclusions:

    • Surface termination significantly impacts SiQD optical properties.
    • Tunable optical properties via sulfur coverage offer potential for advanced device fabrication.
    • Computational methods provide insights into structure-property relationships for functionalized SiQDs.