Jump to main content
Jump to site search

Issue 34, 2015
Previous Article Next Article

On the nature of niobium substitution in niobium doped titania thin films by AACVD and its impact on electrical and optical properties

Author affiliations

Abstract

Niobium doped TiO2 thin films were deposited on silica coated glass substrate using aerosol assisted chemical vapour deposition (AACVD) from hexane solution, at 500 °C. The as-deposited films appeared blue, were transparent in the visible, were reflective in the IR region at around 30% and were electrically conductive (n = 1.23 × 1019 cm−3, μ = 18.9 cm2 V−1 s−1, sheet resistance = 120 Ω □−1). The structure of the films was investigated using XRD, Raman spectroscopy, XPS and X-ray absorption spectroscopy (XAS). No visible phase segregation was found by XRD nor by Raman, though analysis of the Nb K-edge using XANES and EXAFS revealed the presence of niobium both incorporated into the titanium dioxide lattice as well as present in the form of Nb2O5. The high resolution TEM imaging showed sub 4 nm Nb2O5 crystals within the lattice. This work questions the solubility limit of niobium in the TiO2 lattice and suggests previous literature on Nb-doped TiO2 may have overestimated the degree of niobium substitution.

Graphical abstract: On the nature of niobium substitution in niobium doped titania thin films by AACVD and its impact on electrical and optical properties

Back to tab navigation

Supplementary files

Publication details

The article was received on 25 May 2015, accepted on 23 Jul 2015 and first published on 28 Jul 2015


Article type: Paper
DOI: 10.1039/C5TA03772G
Author version available: Download Author version (PDF)
Citation: J. Mater. Chem. A, 2015,3, 17755-17762
  •   Request permissions

    On the nature of niobium substitution in niobium doped titania thin films by AACVD and its impact on electrical and optical properties

    A. J. Gardecka, G. K. L. Goh, G. Sankar and I. P. Parkin, J. Mater. Chem. A, 2015, 3, 17755
    DOI: 10.1039/C5TA03772G

Search articles by author

Spotlight

Advertisements