Optical and electrical properties of sol-gel spin coated titanium dioxide thin films

International Conference on Materials, Alloys and Experimental Mechanics 2017

材料科学;金属学;机械制造

Sahoo, Anusuya^1 ; Jayakrishnan, A.R.^1 ; Kamakshi, K.^2 ; Silva, J.P.B.^3 ; Sekhar, K.C.^1 ; Gomes, M.J.M.^3

Department of Physics, School of Basic and Applied Science, Central University of Tamil Nadu, Thiruvarur

610 101, India^1

Department of Physics, Madanapalle Institute of Technology and Science, Madanapalle, Andhra Pradesh

517325, India^2

Centre of Physics, University of Minho, Campus de Gualtar, Braga

4710-057, Portugal^3

关键词: Band-to-band transition;    Coated titanium;    Current mechanisms;    Optical and electrical properties;    Poole-Frenkel mechanisms;    Sol-gel spin coating method;    Stainless steel substrates;    UV-vis spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/225/1/012021/pdf
DOI  :  10.1088/1757-899X/225/1/012021

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this work; TiO2thin films were deposited on glass and stainless steel substrates by sol-gel spin coating method. The films deposited on glass were annealed at different temperatures (Ta) in the range of 200 to 5000C and that are deposited on steel substrate were annealed at 8000C. The optical properties of TiO2thin films were studied by using UV-VIS spectroscopy and photoluminescence (PL) spectroscopy. The transmittance on the average was found to ≥ 80 % and is found to sensitive to Ta. The PL spectra exhibited the strong emission band associated with band- to- band transition around 390 nm and the two weak bands at 480 and 510 nm associated to the oxygen defects and surface defects respectively. The current-voltage (I-V) characteristics of the Al/TiO2/steel capacitors were studied and analysed with application of various current mechanisms. Analysis reveals that the conduction in Al/TiO2/steel capacitors is governed by Poole-Frenkel mechanism.