Functional properties of silicon nanocrystals in oxygen-rich amorphous matrices formed by laser irradiation of substoichiometric silicon oxides

M Burchielli, G Conte, G Fameli, C Felici, M.C Rossi, A Rubino, S Salvatori, F Villani

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Abstract

Silicon-based nanostructured thin films have been obtained through laser irradiation of amorphous silicon oxides. The optoelectronic properties of nanostructured films largely differ from their amorphous counterpart, exhibiting optical gap narrowing, wavelength-dependent spectral modification of the photoluminescence (PL) and conduction mechanism variations. In particular, following the hydrogen effusion and related defect density increase, a spectral red shift and PL intensity quenching is detected for λexc= 514.5 nm, whereas PL enhancement and spectral blue shift is observed at λcxc= 632.8 nm. Different thermal activation regimes of conductivity are also detected by conductivity measurements. Such results are discussed in terms of microstructural changes from an hydrogenated amorphous network to a nanostructured two-phase material where wavelength-selective excitation of radiative recombination channels and temperature-dependent conductivity paths occurs. © 2002 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)175 - 179
Number of pages5
JournalMaterials Science and Engineering C
Volume19
Issue number1-2
DOIs
Publication statusPublished - 2 Jan 2002
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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