Optical properties of nanogranular and highly porous TiO2 thin films (Articolo in rivista)

Type
Label
  • Optical properties of nanogranular and highly porous TiO2 thin films (Articolo in rivista) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1088/0022-3727/47/48/485301 (literal)
Alternative label
  • Toccafondi, Chiara; Uttiya, Sureeporn; Cavalleri, Ornella; Gemme, Gianluca; Barborini, Emanuele; Bisio, Francesco; Canepa, Maurizio (2014)
    Optical properties of nanogranular and highly porous TiO2 thin films
    in Journal of physics. D, Applied physics (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Toccafondi, Chiara; Uttiya, Sureeporn; Cavalleri, Ornella; Gemme, Gianluca; Barborini, Emanuele; Bisio, Francesco; Canepa, Maurizio (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 47 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 10 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 48 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • University of Genoa; University of Genoa; CNR SPIN; Istituto Nazionale di Fisica Nucleare; Tethis Srl (literal)
Titolo
  • Optical properties of nanogranular and highly porous TiO2 thin films (literal)
Abstract
  • We present a systematic investigation of the optical properties of cluster-assembled TiO2 films (20-150 nm nominal thickness) deposited onto Si wafers and processed with two types of ex-situ oxidation treatments. Spectroscopic ellipsometry (0.7-5 eV energy range), supported by x-ray photoelectron spectroscopy and atomic force microscopy measurements, allowed us to obtain information on the depth-dependent morphology of the films in a non-destructive mode. The characteristic grainy and porous structure of the films was modelled by means of a flexible effective-medium approach, allowing us to obtain a reliable estimate of the amount and distribution of voids into the films and their accessibility to foreign liquids. The absorption-edge broadening and significant optical absorptions within the gap were attributed to the intrinsically nanogranular morphology and to the interrelated defective structure/stoichiometry of the particles, also in relation to the occurrence of poorly accessible interstices or pores in the inner parts of the film. (literal)
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