Abstract
(PVA: Ni (CH3COO)2) films with different thicknesses were prepared by casting
method. The thickness of the prepared films were (15, 20and 25) μm . The optical
transmission (T %)was measured in the wavelength range of (190-900) nm .The effect of
thickness increasing on optical properties such as transmittance, reflectance, absorption
coefficient, refractive index, extinction coefficient in addition of the Real and Imaginary Part
of dielectric constant was studied. This study reveals that all these parameters affected by the
increasing of the thickness, and it also found that the optical energy gap has been increased
with the increasing of the thickness, but the Urbach energy was decreased with the increasing
of the thickness.
method. The thickness of the prepared films were (15, 20and 25) μm . The optical
transmission (T %)was measured in the wavelength range of (190-900) nm .The effect of
thickness increasing on optical properties such as transmittance, reflectance, absorption
coefficient, refractive index, extinction coefficient in addition of the Real and Imaginary Part
of dielectric constant was studied. This study reveals that all these parameters affected by the
increasing of the thickness, and it also found that the optical energy gap has been increased
with the increasing of the thickness, but the Urbach energy was decreased with the increasing
of the thickness.