Phase evolution, morphological, optical and electrical properties of femtosecond pulsed laser deposited TiO2 thin films

Journal article


Kumi-Barimah, E, Penhale-Jones, R, Salimian, A, Upadhyaya, H, Hasnath, A and Jose, G (2020). Phase evolution, morphological, optical and electrical properties of femtosecond pulsed laser deposited TiO2 thin films. Scientific Reports. 10 (1). https://doi.org/10.1038/s41598-020-67367-x
AuthorsKumi-Barimah, E, Penhale-Jones, R, Salimian, A, Upadhyaya, H, Hasnath, A and Jose, G
Abstract

In this paper, we report anatase and rutile titanium oxide (TiO2) nanoparticulate thin films fabricated on silica and Indium Tin Oxide (ITO) substrates using femtosecond pulsed laser deposition (fs-PLD). Depositions were carried-out at substrate temperatures of 25 °C, 400 °C and 600 °C from anatase and rutile phase target materials. Effect of substrate temperature on the surface morphology, microstructural, optical, and electrical properties of these films were systematically investigated by using various range of measurements such as scanning electron microscopy, (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Raman spectroscopy, Ultraviolet–visible-near infrared (UV–Vis–NIR) spectroscopy, and Hall Effect measurements. It is observed that the TiO2 thin films surface are predominated with nanoparticulates of diameter less 35 nm, which constitute about ~ 70%; while the optical bandgaps and electrical resistivity decrease with increasing substrate temperature. A mixed-phase (anatase/rutile) TiO2 thin film was produced at a substrate temperature of 400 °C when samples are fabricated with anatase and rutile target materials. The results of this study indicate that the structural and crystallinity, optical, and electrical properties can be controlled by varying fs-PLD process parameters to prepare TiO2 thin films, which are suitable for applications in photovoltaics, solar cells, and photo-catalysis.

Year2020
JournalScientific Reports
Journal citation10 (1)
PublisherSpringer Science and Business Media LLC
ISSN2045-2322
Digital Object Identifier (DOI)https://doi.org/10.1038/s41598-020-67367-x
Publication dates
PrintDec 2020
Online23 Jun 2020
Publication process dates
Accepted29 May 2020
Deposited24 Jun 2020
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Open
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