I deposited CuS thin film using CBD technique . The precursor were 20ml of 0.1M CuSo4,20ml of 0.1M thiourea and 22ml of 25% ammonia.The resulted film after 1:30 minutes were non-uniform and sometimes there was no film.I have changed the concentration of the precursor but I got the same results.Can anyone give me any advice.

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