Open AccessThe Effect of Band-Gap on TiO2 Thin Film Considering Various Parameters
Author(s) -
Majedul Haque Mithun,
Abu Sayed,
Imteaz Rahaman
Publication year - 2021
Publication title -
proceedings of engineering and technology innovation
Language(s) - English
Resource type - Journals
eISSN - 2518-833X
pISSN - 2413-7146
DOI - 10.46604/peti.2021.7712
Subject(s) - band gap , diethanolamine , absorbance , transmittance , materials science , thin film , analytical chemistry (journal) , spectral line , direct and indirect band gaps , ultraviolet , optics , chemistry , optoelectronics , physics , nanotechnology , chromatography , organic chemistry , astronomy
The aim of this work is to measure the effect of band-gap on TiO2 thin films by changing tetrabutylorthotitanate (TBOT), diethanolamine (DEA), and temperature. The sol-gel method is experimentally introduced to find out the better band-gap of TiO2 thin films by varying the concentration of TBOT (4 ml to 10 ml), DEA (2 ml to 5 ml), and temperature (350°C to 650°C). With the help of an ultraviolet-visible spectrophotometer for the wavelength of 300-900 nm, these thin films are characterized concerning optical properties (transmittance spectra, absorbance spectra, direct band-gap, and indirect band-gap). The direct and indirect band-gaps are found 3.38 eV and 3.25 eV respectively, which are close to or within the standard band-gap range of TiO2 (3.2 eV to 3.35 eV) and are found at 8 ml TBOT, 3 ml DEA, and a temperature of 550°C.