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Effect of the Incorporation of Titanium on the Optical Properties of ZnO Thin Films: From Doping to Mixed Oxide Formation.

Authors :
Yuste, Miriam
Escobar-Galindo, Ramon
Benito, Noelia
Palacio, Carlos
Martínez, Oscar
Albella, Jose Maria
Sánchez, Olga
Source :
Coatings (2079-6412); Mar2019, Vol. 9 Issue 3, p180-180, 1p
Publication Year :
2019

Abstract

ZnO films with Ti atoms incorporated (TZO) in a wide range (0–18 at.%) have been grown by reactive co-sputtering on silicon and glass substrates. The influence of the titanium incorporation in the ZnO matrix on the structural and optical characteristics of the samples has been determined by Rutherford backscattering spectroscopy (RBS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). The results indicate that the samples with low Ti content (<4 at.%) exhibit a wurtzite-like structure, with the Ti<superscript>4+</superscript> ions substitutionally incorporated into the ZnO structure, forming Ti-doped ZnO films. In particular, a very low concentration of Ti (<0.9 at.%) leads to a significant increase of the crystallinity of the TZO samples. Higher Ti contents give rise to a progressive amorphization of the wurtzite-like structure, so samples with high Ti content (≥18 at.%) display an amorphous structure, indicating in the XPS analysis, a predominance of Ti–O–Zn mixed oxides. The energy gap obtained from absorption spectrophotometry increases from 3.2 eV for pure ZnO films to 3.6 eV for those with the highest Ti content. Ti incorporation in the ZnO samples <0.9 at.% raises both the blue (380 nm) and green (approx. 550 nm) bands of the photoluminescence (PL) emission, thereby indicating a significant improvement of the PL efficiency of the samples. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20796412
Volume :
9
Issue :
3
Database :
Complementary Index
Journal :
Coatings (2079-6412)
Publication Type :
Academic Journal
Accession number :
135683468
Full Text :
https://doi.org/10.3390/coatings9030180