UV-irradiated sol-gel spin coated AZO thin films: enhanced optoelectronic properties

Heliyon

Md. Muktadir Billah¹  Tasratur Reaj Neha²  Md. Irfan Khan² 

[1] Corresponding author.;Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka, 1000, Bangladesh;

关键词: Thin film;    Sol-gel;    Optoelectronic;    Burstein-moss effect;    UV irradiation;    UV blocking;   

DOI  :  

来源: DOAJ

【 摘 要 】

Thin films of transparent conductive Al doped ZnO (AZO) thin films were produced via sol-gel spin coating route. Structural, optical, and electrical properties were explored for several dopant concentrations. Formation of crystalline AZO was verified by X-ray Diffraction (XRD) Analysis and structural analysis were carried out later from the XRD data. Highest band gap of 3.67 eV was found for 2 mol % AZO thin films. The average transmittance was found to be 84.19% in the visible spectra for the corresponding thin films. 2 mol% AZO also exhibited a minimum resistivity of 2.05 Ω-cm with a maximum value of figure of merit. Prolonged UV irradiation was applied to 2 mol % AZO thin films prior to annealing. It significantly modified the surface morphology of the film and provided shielding near UVA (315–378 nm) spectrum. This also enhanced the conductivity of the thin film by 3-fold compared to non-UV treated sample and decreased optical band gap significantly.

【 授权许可】

Unknown