Luminescence Efficiency of Si/SiO2 Nanoparticles Produced by Laser Ablation

Risultato della ricerca: Article

Abstract

Photoluminescence properties of Si(core)/SiO 2 (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 2 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 2 and their nature is affected by the latter.
Lingua originaleEnglish
pagine (da-a)1800565-1-1800565-5
Numero di pagine5
RivistaPHYSICA STATUS SOLIDI. A, APPLICATIONS AND MATERIALS SCIENCE
Volume216
Stato di pubblicazionePublished - 2019

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Laser ablation
laser ablation
Luminescence
luminescence
Nanoparticles
nanoparticles
Defects
defects
radiative recombination
Pulsed lasers
Quantum efficiency
Passivation
Excitons
passivity
quantum efficiency
Luminance
interlayers
pulsed lasers
Photoluminescence
brightness

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cita questo

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title = "Luminescence Efficiency of Si/SiO2 Nanoparticles Produced by Laser Ablation",
abstract = "Photoluminescence properties of Si(core)/SiO 2 (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 2 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 2 and their nature is affected by the latter.",
author = "Tiziana Fiore and Fabrizio Messina and Gelardi, {Franco Mario} and Simonpietro Agnello and Lavinia Vaccaro and Marco Cannas and Francesco Amato and Pietro Camarda",
year = "2019",
language = "English",
volume = "216",
pages = "1800565--1--1800565--5",
journal = "Physica Status Solidi (A) Applications and Materials Science",
issn = "1862-6300",
publisher = "Wiley-VCH Verlag",

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TY - JOUR

T1 - Luminescence Efficiency of Si/SiO2 Nanoparticles Produced by Laser Ablation

AU - Fiore, Tiziana

AU - Messina, Fabrizio

AU - Gelardi, Franco Mario

AU - Agnello, Simonpietro

AU - Vaccaro, Lavinia

AU - Cannas, Marco

AU - Amato, Francesco

AU - Camarda, Pietro

PY - 2019

Y1 - 2019

N2 - Photoluminescence properties of Si(core)/SiO 2 (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 2 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 2 and their nature is affected by the latter.

AB - Photoluminescence properties of Si(core)/SiO 2 (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 2 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 2 and their nature is affected by the latter.

UR - http://hdl.handle.net/10447/350331

UR - https://onlinelibrary.wiley.com/doi/10.1002/pssa.201800565

M3 - Article

VL - 216

SP - 1800565-1-1800565-5

JO - Physica Status Solidi (A) Applications and Materials Science

JF - Physica Status Solidi (A) Applications and Materials Science

SN - 1862-6300

ER -