研究目的
Investigation of optical and electrical properties of lithium doped ZnO nano films.
研究成果
The research successfully synthesized undoped and Li-doped ZnO nano films with enhanced optical and electrical properties. Li doping reduced crystalline size, increased micro strain, improved transmittance above 90% in visible range, and increased conductivity with ohmic behavior. This suggests potential for Li-doped ZnO as a p-type material in optoelectronics applications, with recommendations for future studies on higher doping concentrations and device integration.
研究不足
The study is limited to specific doping concentration (10% Li), substrate types (glass and silicon), and annealing conditions. EDAX cannot detect lithium, and the method may have constraints in controlling film uniformity and reproducibility. Potential optimizations include varying doping levels, using different substrates, or alternative deposition methods.
1：Experimental Design and Method Selection:
The study used sol-gel spin coating method for fabricating undoped and lithium doped ZnO nano films on glass and silicon substrates, with post-annealing at 350°C. Theoretical models include Debye-Scherrer equation for crystalline size estimation and Williamson-Hall method for strain calculation.
2：Sample Selection and Data Sources:
Samples were prepared using zinc acetate dihydrate, 2-methoxyethanol, ethanolamine, and lithium acetate as precursors, purchased from sigma-Aldrich.
3：List of Experimental Equipment and Materials:
Equipment includes Rigaku X-ray Diffractometer (XRD) with Cu-kα radiation, Shimadzu UV-2600 spectrophotometer, Keithley instrument with Signature 1160 series probe for I-V measurements, and field emission scanning electron microscope (FESEM) for morphology. Materials include glass and silicon substrates, and chemical precursors.
4：Experimental Procedures and Operational Workflow:
Solution preparation involved stirring precursors, aging for 3 hours, spin coating at 2000 rpm for 30 s, heat treatment at 225°C after each coating, and final annealing at 350°C. Characterization involved XRD, UV-visible spectroscopy, FESEM, EDAX, FTIR, and I-V measurements.
5：Data Analysis Methods:
Data analysis used Debye-Scherrer equation for crystalline size, Williamson-Hall method for strain, and extrapolation method for optical band gap from absorption spectra.
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