CaO Thin-Film Preparation using Chemical Bath Deposition..

Calcium oxide (CaO) thin films were created using the chemical bath deposition process on glass substrates (slides). The optical and structural characteristics of films have been examined using contemporary testing methods, such as x-ray spectroscopy, field emission scanning electron microscopy, and spectrophotometers. The effect of deposition temperature, deposition period and potassium hydroxide (KOH) concentration has been investigated, the optical and structural characteristics of the CaO films clearly vary throughout all experiments. The film’s transmittance, absorbance and energy gap varied clearly with wave length. For films created using solutions with (1.702 and 3.92)g of KOH concentration, the energy gap rises from (2.38 to 2.58) eV, but for films made at (50 and 70)°C, it rises from (2.7 to 2.9)eV. The energy gap decreases from 2.6eV to 2.4eV for the films prepared at deposition periods (20 and 30) min. the scanning electron microscope images and x ray spectrums for all samples agree with the variation in the optical properties.