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以三水醋酸铅、醋酸锶、钛酸丁酯为原料,乙二醇甲醚、去离子水、乙酰丙酮做溶剂。用溶胶-凝胶法制备(Pb0.50Sr0.50)TiO3 (PST)前驱体溶液,通过旋涂工艺在石英玻璃基片上沉积 PST 薄膜。薄膜经 650 至 800 ℃退火 30 min,升温速率为 3℃/min。不同温度晶化的 PST 薄膜用 X 射线衍射测量其晶体结构,用原子力显微镜观测其表面形貌。不同温度退火薄膜的光学透射谱用双光束紫外-可见光分光光度计测量。薄膜的吸收边,即带隙能可以根据直接跃迁估计。650、700、 750 和 800℃退火的薄膜样品的直接带隙能分别为 3.74、3.75、3.76 和 3.75 eV。
Lead acetate trihydrate, strontium acetate, butyl titanate as raw material, ethylene glycol methyl ether, deionized water, acetylacetone solvent. A (Pb0.50Sr0.50) TiO3 (PST) precursor solution was prepared by a sol-gel method and a PST film was deposited on a quartz glass substrate by a spin-on process. The films were annealed at 650 to 800 ℃ for 30 min, and the heating rate was 3 ℃ / min. The crystalline structure of PST films crystallized at different temperatures was measured by X-ray diffraction and observed by atomic force microscopy. The optical transmission spectra of different temperature annealed films were measured with a two-beam UV-Vis spectrophotometer. The absorption edge of the film, ie, the bandgap energy, can be estimated from the direct transition. The direct bandgap energies of the films annealed at 650, 700, 750 and 800 ℃ were 3.74, 3.75, 3.76 and 3.75 eV, respectively.