研究目的
To investigate the influence of thickness on the optical properties of Sb doped ZnO thin films.
研究成果
The optical band gap of Sb doped ZnO thin films decreases with increasing thickness, from 2.989 eV at 200 nm to 2.779 eV at 400 nm, indicating that thickness can be used to tailor the band gap for specific optoelectronic applications. This reduction is attributed to factors like lattice disorder and internal stress. The research highlights the potential for designing materials with desired optical properties through thickness control, suggesting future studies on other dopants or deposition methods.
研究不足
The study is limited to Sb doped ZnO thin films prepared by thermal evaporation; other doping methods or materials were not explored. The thickness range was only up to 400 nm, and substrate temperature was fixed at 50°C, which may not cover all possible conditions. Potential optimizations include varying doping concentrations, using different deposition techniques, or exploring a wider range of thicknesses and temperatures.
1：Experimental Design and Method Selection:
The study used thermal evaporation to prepare Sb doped ZnO thin films of various thicknesses on glass substrates. The solid-state reaction technique was employed for composition preparation. Optical properties were analyzed using UV-VIS-NIR spectrophotometry and EDAX for compositional analysis.
2：Sample Selection and Data Sources:
Samples were prepared with thicknesses of 200 nm, 300 nm, and 400 nm. Data were collected from the fabricated thin films.
3：List of Experimental Equipment and Materials:
Electronic balance for weighing powders, thermal evaporation setup, EDAX equipment, UV-VIS-NIR spectrophotometer (300-2500 nm), glass substrates, Sb powder, ZnO powder.
4：Experimental Procedures and Operational Workflow:
Weigh 10% Sb powder and 90% ZnO powder using an electronic balance. Prepare composition via solid-state reaction. Deposit films using thermal evaporation. Analyze composition with EDAX. Measure optical transmittance, reflectance, and absorption coefficient with spectrophotometer. Calculate band gap from absorption data.
5：Data Analysis Methods:
EDAX spectra analyzed for elemental composition. Optical data analyzed using the relation for direct allowed transitions to determine band gap energy and parameter A1.
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