Effect of Annealing Temperature on the Optical Properties of Bismuth Sulfide (Bi2S3)

The effect of annealing temperature on the optical properties of Bismuth Sulfide was studied. A chemical bath deposition technique was employed in the synthesis, and UV-Vis spectroscopy (Spectrum lab 752s) was used to measure the optical properties. The measurement was carried out at a wavelength range between 200 nm and 500 nm. The transmittance increased with an increase in wavelength, and lower values were observed at higher annealing temperatures. The absorbance is high at higher annealing temperatures, and its value decreases with increased wavelength. The reflectance also has high values at high annealing temperatures, and its value increases with an increase in wavelength. The band gap was found to decrease with an increase in annealing temperature. It is clearly shown that the annealing temperature greatly affects the optical properties of Bismuth Sulfide semiconductors.