المحضرة بطريقة التحلل الكيميائي الحراري(ZnO:Bi) الخصائص التركيبية والبصرية لاغشية

الملخص

In this research , the study of the structure properties and some
properties optical properties of zinc oxide (ZnO) thin films prepared by
the chemical spray pyrolysis technique. These thin films were deposited
on the glass substrates heated at (400 OC) and the overage hickness was
about ( 300 nm). The effect of Bismuth doing with different ratios
(1,2,3,4,%) on the structural and optical properties of the Zno films has
been studied.The (XRD) results showed that all the prepared films have
polycrystalline single phase and the structure was hexagonal wurtzite
with a preferred orientation along (002) plane.The average grain size
decreased from (45nm) to (12 nm) by in increasing the doping percentage
also, the (AFM) image show different surface morphology for the
prepared films.The absorbance and transmittance spectra have been
recorded in the wavelength range (380-900 nm) in order to study the
optical properties. It was found that the maximum transmittance inereased
to (83%) at (ZnO) pure, and the optical energy gap for allowed direct
transition electronic (3.3eV) for ZnO, while the increase in doping
percentadage led to decrease in the value of the energy gap and for
maximum doping (4%) it reach (3.0 eV), on contrary with urbach energy
which increase as the doping percentage increase where equal (135 meV)
for (ZnO) and when (4%) it reaches (333 meV).