Growth of Fe_2O_3 thin films and Fe_2O_3-doped ZnO micron-flower by using modified Spray Coating Method

摘要

Fe_2O_3-doped ZnO thin films can be used as the multiferroic materials, which show simultaneous ferroelectric and magnetic ordering, exhibit unusual physical properties, and in turn, promise new device applications. In this study, iron nitrate [Fe(NO_3)_3 ? 6H_2O] and zinc nitrate [Zn(NO_3)_2?6H_2O] were mixed with deionized (D. I.) water to form the 1 mol% Fe_2O_3 and 1 mol% Fe-doped ZnO solution (ZnO: Fe_2O_3 = 95:5). Fe_2O_3 thin films and Fe-doped ZnO thin films were hoped to be prepared by using the modified Spray Coating Method (m-SCM). Fe_2O_3 solution was annealed from 300°C to 700°C and Fe-doped ZnO solution was annealed from 200°C to 700°C for densification and crystallization. We found that Fe_2O_3 thin films formed a cracked-piece structure and Fe-doped ZnO formed a micron-flower structure. The influences of the annealing temperature on surface morphology, resistivity (ρ), hall mobility (μ), and carrier concentration of Fe_2O, thin films were investigated. The influence of the annealing temperature on surface morphology of Fe-doped ZnO micron-flowers was also investigated.