I am preparing ZnO thin film by the chemical bath deposition method. Although I have worked with several parameters and tried many times to have a uniform film I am not able to form a uniform film yet. Please give me some suggestions about how do I make the film more uniform in the CBD method?
I recommend trying to follow methods from existing literature as closely possible. Works that have been highly cited likely have repeatable methods. Without knowing exactly what parameters you are experimenting with, it's hard to say exactly what the issue is. Certainly the concentrations, pH, temperature, and substrates all play a role. Please see these two papers, and I recommend some additional literature review to find more.
https://www.sciencedirect.com/science/article/pii/S2405609X15300749
https://www.researchgate.net/publication/230777305_Chemical_bath_deposition_and_characterization_of_nanocrystalline_ZnO_thin_films
The ZnO thin films were prepared by chemical bath technique at room temperature (28 °C). The reaction bath is composed of ZnCl2, NaOH and TEA (tri ethanolamine) used as complexing agent. For deposition of the film, commercial quality glass microscope slides of dimension 16 mm × 26 mm × 1 mm are used.
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