Catalytic role of adsorbates in the photoluminescence emission of Si nanocrystals (Articolo in rivista)

Type
Label
  • Catalytic role of adsorbates in the photoluminescence emission of Si nanocrystals (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1103/PhysRevB.78.245425 (literal)
Alternative label
  • Faraci G; Gibilisco S; Pennisi AR; Franzo G; La Rosa S; Lozzi L (2008)
    Catalytic role of adsorbates in the photoluminescence emission of Si nanocrystals
    in Physical review. B, Condensed matter and materials physics; The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Faraci G; Gibilisco S; Pennisi AR; Franzo G; La Rosa S; Lozzi L (literal)
Pagina inizio
  • 245425 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 78 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 24 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Università di Catania, Dipartimento di Fisica & Astronomia, Catania, Italy; CNR-INFM MATIS, Catania, Italy; Università dell'Aquila, Dipartimento di Fisica, L'aquila, Italy; Sincrotrone di Trieste, Elettra, Trieste, Italy (literal)
Titolo
  • Catalytic role of adsorbates in the photoluminescence emission of Si nanocrystals (literal)
Abstract
  • Silicon nanocrystals were synthesized and deposited on different substrates. In order to clarify the photoluminescence (PL) emission of these agglomerates, we studied the luminescence spectra of several samples as a function of the exposure to air, oxygen, nitrogen, and rare gases. Measurements at different pressures reveal a strong enhancement of the PL at atmospheric pressure, when the sample is in air. In contrast no significant PL is observed for clean Si quantum dot in rare-gas atmosphere and in air at low pressure. Different behavior is detected in oxygen and in nitrogen as a function of the pressure. These data point out a catalytic role of the surface adsorption adding significant information for clarifying the PL mechanism. A comparison of our results, including the decay-time spectra with data and models of literature, demonstrates the important role of the phonon interaction in the relaxation and decay processes. (literal)
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