Skip to main content
padlock icon - secure page this page is secure

Temperature Dependence of the Photoluminescence from Ensembles of Amorphous Silicon Nanoparticles with Various Average Sizes

Buy Article:

$106.23 + tax (Refund Policy)

Amorphous SiO x thin films with three different oxygen contents (x = 1.3, 1.5, and 1.7) have been deposited by thermal evaporation of SiO in vacuum. Partial phase separation in the films has been induced by annealing at 773 or 973 K in argon for 60 and 120 min and thus Si-SiO x composite films have been prepared containing amorphous Si nanoparticles of various sizes (<3 nm). Photoluminescence from the films has been measured in the temperature range 20–296 K. The single Gauss band observed in the photoluminescence spectra of the samples with x = 1.3 and centered in the range 1.55–1.75 eV has been related to radiative recombination in Si nanoparticles. Two bands, a red-orange one (related to radiative recombination in Si nanoparticles) and a green band peaked at ∼2.3 eV (related to radiative recombination via defects) have been resolved in the photoluminescence spectra of the films with x = 1.5 and 1.7. The band in the spectra of the x = 1.3 samples has shown a relative strong thermal quenching but it is significantly weaker than the photoluminescence quenching in bulk a-Si. Besides, the higher the initial oxygen content, the weaker is the photoluminescence thermal quenching. These observations have been related to carrier confinement which is stronger in smaller nanoparticles. The thermally induced photoluminescence decrease with increasing temperature in the samples with x = 1.3 obeys the relation that is characteristic for bulk a-Si:H while the photoluminescence decrease in x = 1.5 and 1.7 samples is of Arrhenius type. We suggest that in nanoparticles larger than 2 nm recombination via band tail states is the dominating photoluminescence mechanism while in smaller nanoparticles exciton-like recombination dominates.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics


Document Type: Research Article

Publication date: February 1, 2011

More about this publication?
  • 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.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more