IMPROVEMENT OF THE CRYSTALLINITY AND OPTICAL PARAMETERS OF ZnO FILM WITH ALUMINUM DOPING

Abstract

In this study, the undoped and Aluminum (Al) doped (1% and 3%) zinc oxide (ZnO) films were prepared by sol gel method via spin coating onto glass substrates. To investigate the structural and optical properties of the films, it was used to X-ray diffractometer and UV-VIS spectrophotometer, respectively. The prepared ZnO films are polycrystalline with a hexagonal wurtzite structure with a preferential orientation according to the (002) plane. The crystalline quality of ZnO film was improved by the increase of Al content. So, the most intense of (002) peak is observed for 3% Al-doped ZnO film. According to UV-vis spectroscopy spectra, the average optical transmittance and reflectance of all the films are greater than 76% and 14% in the visible range, respectively. The different methods were used to evaluate the absorption edges of the prepared films depending on the Al dopants. The optical band gap value of ZnO film shifted towards to the blue region in the first incorporation of Al in ZnO film, and then, this value shifted towards the red region with increasing Al content. The optical constants such as refractive index, extinction coefficient and dielectric constants were determined for undoped and Al doped ZnO films. The refractive index dispersion of the films was analyzed by using the single oscillator model. The dispersion parameters such as oscillator energy and dispersion energy values of the prepared films were determined.

ZnO:Eu Filmlerinin Mikroyapısal ve Optik Özellikleri

“…Böylece, daha geniş bir yelpazede fiziksel özelliklere sahip olan ZnO filmlerinin uygulama alanları daha da genişlemektedir. Al, In, Cd, Sn katkılı ZnO filmleri ile ilgili çalışmalar literatürde daha eski ve oldukça fazla yer almakla beraber [9][10][11][12], La, Eu, Gd ve Er gibi nadir toprak elementleri (rareearth elements) ile katkılama daha sonraları başlamış olmasından dolayı, bu katkı elementleri ile ilgili çalışmalar literatürde daha az bulunmaktadır [13][14][15][16][17][18].…”

Growth of ZnO nanorods on FTO glass substrate

“…Due to the fact that the transmittance increases with increasing crystalline quality, FTO/ZnO film demonstrated an excellent transmittance in visible and IR wavelength. In addition, the red shift in the E g value indicates the enhanced crystallinity of the thin film [39]. Several researches have been done to decrease the E g of ZnO by doping with other metals such as Fe, Cu, Al Ag.…”