Optical Properties Tuning of SnO2 Films by Metal Incorporation (Pt,Pd): Correlation with Microstructure Change
| Autor: | Mounir Gaidi, Michel Labeau, A. Hajjaji, Brahim Bessais, Brenard Chenevier, My Ali El Khakani |
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| Přispěvatelé: | Ecole Nationale des Sciences Appliquées, Université Chouaib Doukkali (UCD), Laboratoire des matériaux et du génie physique (LMGP ), Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Science et Ingénierie des Matériaux et Procédés (SIMaP), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG) |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) Band gap Doping General Engineering Analytical chemistry General Physics and Astronomy 02 engineering and technology [CHIM.MATE]Chemical Sciences/Material chemistry engineering.material 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Lattice constant Ellipsometry 0103 physical sciences engineering Noble metal Crystallite Thin film 0210 nano-technology |
| Zdroj: | Japanese Journal of Applied Physics Japanese Journal of Applied Physics, Japan Society of Applied Physics, 2009, 48 (7), pp.072501. ⟨10.1143/jjap.48.072501⟩ |
| ISSN: | 0021-4922 |
| DOI: | 10.1143/jjap.48.072501⟩ |
| Popis: | International audience; In this work, we report on the effect of noble metal doping (namely Pd or Pt) on the optical properties of SnO2 thin films. The optical constants (n and k) of the films, as a function of noble metal nature and content, were obtained using variable angle spectroscopic ellipsometry in the ultraviolet-visible-near infrared (UV-vis-NIR) regions. Ellipsometry analysis showed that we can tune the optical constants of SnO2 films by changing Pt or Pd doping concentration. In particular, their refractive index increases from 1.6 to similar to 2 while varying Pt content from 3 to 12 at. %. The origin of this optical behaviour was correlated to the microstructure change induced by metal doping. X-ray diffraction (XRD) was used to investigate the effect of doping on SnO2 lattice parameter, on crystallite size and on film preferential orientation. Atomic force microscopy (AFM) was used to estimate the surface roughness of the films. A metal concentration of similar to 3 at.% (for both Pt and Pd), which is known to yield the highest SnO2 gas sensing response, was found to correspond to the highest contraction of the lattice parameter of the films. Finally, the energy band gap of undoped SnO2 thin films (estimated to 4 eV) was found to shift to lower value while increasing doping concentrations. (C) 2009 The Japan Society of Applied Physics DOI: 10.1143/JJAP.48.072501 |
| Databáze: | OpenAIRE |
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