Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.apsusc.2017.09.135
Title: Ti1-xSnxO2 Nanofilms:Layer-by-layer Deposition with extended Sn solubility and Characterization
Authors: YONG ZHIHUA 
Jiajun Linghu
Shibo Xi
Hui Ru Tan
SHEN LEI 
Yang Ping 
Hui Kim Hui
Jian Qing Cao
Meng Lee Leek
YIN XINMAO 
FENG YUAN PING 
Pan Jisheng 
Keywords: TiO2 thin films
Pulsed laser deposition (PLD)
XPS (X-ray photoelectron spectroscopy)
HRTEM
EXAFS
XRD diffraction
Reciprocal space mapping
RHEED
RBS
AFM (atomic force microscopy)
DFT calculation
Issue Date: 15-Jan-2018
Publisher: Elsevier: Applied Surface Science
Source: Jiajun Linghu, Shibo Xi, Hui Ru Tan, Yang Ping, Hui Kim Hui, Jian Qing Cao, Meng Lee Leek, FENG YUAN PING, Pan Jisheng, SHEN LEI, YONG ZHIHUA, YIN XINMAO (2018-01-15). Ti1-xSnxO2 Nanofilms:Layer-by-layer Deposition with extended Sn solubility and Characterization. Applied Surface Science 428 : 710-717. ScholarBank@NUS Repository. https://doi.org/10.1016/j.apsusc.2017.09.135
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
Abstract: High quality rutile Ti1-xSnxO2 nanofilms were successfully grown in a layer-by-layer mode at a moderately low temperature of 400oC using pulsed laser deposition (PLD). High solid solubility of up to x = 0.216 has been achieved in the Ti1-xSnxO2 films despite theoretical prediction by Density functional theory (DFT) of large formation energy (~5.64 eV) required for the substitutional alloy to exist at such high Sn concentration. The resultant films have smooth interfaces and step-terraced surfaces with well controlled stoichiometry and are optically transparent. Sn L3-edge Extended X-ray absorption fine structure (EXAFS) reveals the substitution of Sn4+ in the Ti4+ lattice sites of TiO2. The lattice spacing along [110] increases linearly with increment in x due to substitution of Sn4+ ions in the Ti lattice sites of the Ti1-xSnxO2 films. X-ray photoelectron spectroscopy (XPS) and Rutherford backscattering (RBS) show that Sn is uniformly distributed on the surface and in the bulk of the films. These results are crucial when considering Ti1-xSnxO2 with suitable composition for making TiO2 based quantum structures in advanced optoelectronic devices and solar energy materials, where high-quality crystalline thin film-substrates are important.
Source Title: Applied Surface Science
URI: http://scholarbank.nus.edu.sg/handle/10635/137321
ISSN: 01694332
DOI: 10.1016/j.apsusc.2017.09.135
Rights: Attribution-NonCommercial-NoDerivatives 4.0 International
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