研究目的
Investigating the effect of annealing on the optical properties of zinc oxide thin films prepared by a homemade spin coater.
研究成果
The study demonstrated that annealing temperature significantly affects the optical band gap energy of ZnO thin films, with a narrowing observed as temperature increased. The method provides a simple and cost-effective way to prepare ZnO thin films with tunable optical properties.
研究不足
The crystalline quality of ZnO prepared by the sol-gel process might be inferior to other methods due to low temperature annealing affecting structural and optical characteristics.
1：Experimental Design and Method Selection:
The study used the sol-gel method for preparing ZnO thin films, with spin coating as the deposition technique. The films were annealed at different temperatures to study their optical properties.
2：Sample Selection and Data Sources:
Ordinary glass substrates were used for depositing ZnO thin films. The precursor solution was prepared using zinc acetate dihydrate, ethanol, and diethanolamine.
3：List of Experimental Equipment and Materials:
Homemade spin coater, hot air oven, muffle furnace, X-ray diffractometer (D2 phaser Bruker), USB 2000 spectrophotometer (Ocean Optics).
4：Experimental Procedures and Operational Workflow:
The precursor solution was spin-coated onto glass substrates, dried, and then annealed at 300o, 400o, and 500oC. The films were characterized using XRD and UV-visible spectroscopy.
5：Data Analysis Methods:
The crystallite size was calculated using the Debye-Scherrer equation. The optical band gap was determined using Tauc’s plot method.
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