Optical Characterization of Chemical Bath Deposited Bismuth Oxyiodide (BiOI) Thin Films

Authors : F I EZEMA

Pages : 105-114

Doi:10.3906/sag-1206-98

View : 16 | Download : 7

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Thin films of Bismuth oxyiodide insert ignore into journalissuearticles values(BiOI); were deposited, using chemical bath deposition techniques. The films were characterized using energy dispersive x-ray fluorescence insert ignore into journalissuearticles values(EDXRF); and Fourier transform infrared insert ignore into journalissuearticles values(FTIR); spectroscopy for chemical composition, and a spectrophotometer for the analysis of spectral absorbance / transmittance / reflectance. Deposited film thickness ranged between 0.115 and 0.140 m m. The optical properties deduced from the spectral absorbance / transmittance / reflectance include the maximum values of the refractive index n that ranged between 2.62 and 2.64, the extinction coefficient k ranged between 25.84 \times 10-3 and 42.92 \times 10-3 while the Optical conductivity s ranged between 0.60 \times 1014 S-1 and 0.75 \times 1014 S-1. The spectral analysis revealed that some of the films grown are poor transmitters of UV but have good transmission in the VIS-NIR regions. Some of the films show transmittance above 78% in the VIS-NIR regions and a wide band gap that ranged between 3.20 and 3.40 eV. In the mid infrared regions transmittance ranged between 3 and 37%. These properties make the film potential material for poultry protection and warming coatings, solar control and antireflection coatings and as well material for solar cell fabrication.
Keywords : Chemical bath deposition technique, Bismuth oxy iodide, poultry protection and warming coating, solar control and antireflection coatings and solar cells