Effect of pre-annealing and annealing temperature on microstructural and optical properties of multiferroic BiFeO_3 thin films prepared by chemical solution deposition (CSD)

摘要

BiFeO_3 thin films has been successfully grown on a quartz substrate using the chemical solution deposition (CSD) method. X-ray diffraction (XRD) used to determine the microstructure of BFO. The morphology and transmittance of BFO thin film were studied using SEM and UV-VIS. Deposition of the BiFeO_3 thin film with pre-annealing in air and variation of annealing temperature showed that the increase in annealing temperature caused crystallinity to be higher and crystallite size to increase. High annealing temperature results in a larger grain size and lower thickness. Deposition of the BiFeO_3 thin film with pre-annealing variation showed that BiFeO_3 with pre-annealing in air had a higher crystallinity compared with in O_2. The crystallite size of BiFeO_3 with pre-annealing in O_2 is greater than pre-annealing in air. BiFeO_3 with pre-annealing in air has a smaller grain size and greater thickness compared to preannealing in O_2. BiFeO_3 band gap with pre-annealing in air and variation of annealing temperature were obtained 1.4-3.5 eV. While the BiFeO_3 band gap with pre-annealing variation was obtained from 2.3-2.7 eV.