ABSTRACT
Using a vacuumed spray method, Zinc Oxide has been synthesized in a vacuum at a room temperature with different thicknesses. Absorbance and transparency have been studied as a function of wavelength variation before and after annealing the samples. Peaks have occurred at different wavelengths. Energy gap variation of the same samples has been examined with wavelength variation, Eg has been dramatically reduced as wavelength increased, its best value was 1.95 eV at 700 nm. Annealing has no abrupt change on energy gap.
