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Luminescence Efficiency of Si/SiO Nanoparticles Produced by Laser Ablation

Physica Status Solidi (A) Applications and Materials Science, ISSN: 1862-6319, Vol: 216, Issue: 3
2019
  • 4
    Citations
  • 0
    Usage
  • 11
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    4
    • Citation Indexes
      4
  • Captures
    11

Article Description

Photoluminescence properties of Si(core)/SiO (shell) nanoparticles produced by pulsed laser ablation in aqueous solution are investigated with the purpose to highlight the microscopic processes that govern the emission brightness and stability. Time resolved spectra evidence that these systems emit a µs decaying band centered around 1.95 eV, that is associated with the radiative recombination of quantum-confined excitons generated in the Si nanocrystalline core. Both the quantum efficiency and the stability of this emission are strongly dependent on the pH level of the solution, that is changed after the laser ablation is performed. They enhance in acid environment because of the H passivation of non radiative defects, located in the Si/SiO interface, which causes the growth of IR-active SiH groups. On the basis of the reported experimental results and previous literature data, we propose that the non radiative defects are located in the suboxide interlayer between Si and SiO and their nature is affected by the latter.

Bibliographic Details

Marco Cannas; Pietro Camarda; Lavinia Vaccaro; Francesco Amato; Fabrizio Messina; Tiziana Fiore; Simonpietro Agnello; Franco Mario Gelardi

Wiley

Materials Science; Physics and Astronomy; Engineering

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