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Calcium fluoride ( CaF2 ) thin films were deposited on glass slides [which were initially soaked in concentrated hydrochloric acid (HCl), to remove impurities], using chemical bath deposition method at 0.03 0.09 and 0.15 molar concentration for 3 hours at 50℃. .
A 7565 UV-VIS Double beam UV/VIS Spectrophotometer was used to measure the spectral absorbance of the thin films with wavelength ranging from 371nm to 1090nm . Other Optical properties were calculated based on theory.
The Calcium fluoride (CaF2) recorded a low absorbance (A) and low reflectance (R) and a very high transmittance (T) within the average range of 0.998 to 0.995 for 0.06m to 0.12M respectively. The films has a refractive index less than 1.8 which could be useful for anti-reflection coatings, eyeglass coatings, etc.
The band gap fell with the range of 1.5 – 3.0 eV which could also be useful as a thin film solar cell for generation of solar electricity.
