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Optical properties and current conduction in annealed (Ta2O5)0.94 � (TiO2)0.06 thin films

Thapliyal, P and Panwar, NS and Rao, GM (2021) Optical properties and current conduction in annealed (Ta2O5)0.94 � (TiO2)0.06 thin films. In: Superlattices and Microstructures, 158 .

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Official URL: https://doi.org/10.1016/j.spmi.2021.107008


By sputtering the mosaic assembly of tantalum (Ta) and titanium (Ti) metal targets in the oxygen environment, (Ta2O5)1�x�(TiO2)x, x = 0.06, thin films were deposited onto the quartz, and P/boron-silicon (1 0 0) substrates, at room temperature (RT). The RT deposited films were annealed for 1.5 h, from 500 to 800 °C. Formation of the crystal structure in the films was observed at and above 700 °C annealing. Optical transmittance data, measured with the UV�Vis spectrophotometer, were used to find out the extinction coefficient (k), refractive index (nopt), and optical bandgap (Eg) of the prepared films. With the increasing annealing temperature, both the nopt and Eg values were observed, decreasing from 2.218 to 2.160, and 4.23 to 4.02 eV, respectively. The extinction coefficient of amorphous films was observed lesser than the crystalline films. The current�voltage characteristics of the prepared film assisted metal�oxide�semiconductor (MOS) structures manifest different conductions, viz., ohmic at the lower electric fields; and Schottky, Poole�Frenkel, Fowler�Nordheim tunneling and space�charge�limited current, in the intermediate to higher fields, for different annealing treatments. © 2021 Elsevier Ltd

Item Type: Journal Article
Publication: Superlattices and Microstructures
Publisher: Academic Press
Additional Information: The copyright for this article belongs to Academic Press
Keywords: Annealing; Crystal structure; Electric fields; Energy gap; Film preparation; Optical band gaps; Oxide films; Sputtering; Thin films; Titanium dioxide, Conduction Mechanism; Current conduction; Metal target; Optical currents; Optical-bandgap; Property; Thin-films; TiO-2; Titanium metals; Tunneling, Refractive index
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 09 Dec 2021 09:30
Last Modified: 09 Dec 2021 09:30
URI: http://eprints.iisc.ac.in/id/eprint/69745

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