09 خرداد 1403
ولي دلوجي

ولی دلوجی

مرتبه علمی: دانشیار
نشانی:
تحصیلات: دکترای تخصصی / فیزیک حالت جامد
تلفن: 0813339841
دانشکده: دانشکده علوم پایه

مشخصات پژوهش

عنوان
Effect of annealing processing on morphology, spectroscopy studies, Urbach disordering energy, and WDD dispersion parameters in Cu-Al doped zinc oxide films
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Nanoparticles size, annealing processing, CAZO films; optical band gap, the single oscillator model
سال
2020
مجله JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
پژوهشگران ولی دلوجی

چکیده

In this article, a mosaic target made of ZnO and Al-Cu atoms were used for fabricating of the Cu-Al doped zinc oxide films (CAZO films) using RF magnetron co-sputtering. The CAZO films were deposited in room temperature on glass substrates with the sputtering gases O2 and Ar in proportion of 30%. Then, films were annealed at different temperatures of 400, 500, and 600 C in a electrical furnace with Ar atmosphere. Atomic Force Microscopy images showed that the size of nanoparticles in films annealed at 600 C have maximum value about of 18.8 nm. Atomic Force Microscopy data shown that the films annealed at 600 C were rougher and they were about of 4.68 nm. Transmittance T(k) and reflectance R(k) measurements in the wavelength range (300–2500 nm) were used to calculate the absorption coefficient a (k), the refractive index n(k), the optical dispersion parameters according to Wemple and Didomenico, and the optical band gap of films. The optical band gap has been estimated and confirmed by five different methods. It can be seen that with increasing annealing temperature the optical band gap of films were decreased. Films annealed at 400C have more disordered. It is found that the as films annealed at 500C have minimum values of the dispersion energy Ed and the oscillator strength fin about of 0.57 eV and 2.42 (eV)2 , respectively. The as deposited films have minimum values of oscillator length strength S0 in about of 5.5 lm2 .