Hi,

What is the thickness you are trying to obtain?

Each precursor has a different deposition rate. Usually solutions of 0.02M-0.4M are being used, but its material dependent. 

Solvent effect is quite strong. They differ by boiling points/density etc, hence the evaporation process could take a longer/shorter time and this could affect the layer formation mechanism.

Note that also the use of solvents will vary the surface tension of the precursor solution, therefore the spray formation would be affected as the spray droplets will be smaller or even will not form depending on the spray formation conditions (for example, we didnt had spray using a small ultrasonic nebulizer when using metanol/water mixtures). Also the morphology will be influenced. As Adam mentioned, the evaporation process will take longer/shorter time, hence the coating uniformity, grain size and the habit of growth would change. About the thickness, it depends on the precursor concentration you are using as well as the on the incoming flux, you can do an estimation  with a simple calculation considering the amount of solution coming onto the substrate, the concentration of your precursor solution and the substrate area. Droplet sizes are reported somewhere (I do not have the link right now, sorry), depending on the solvent/water proportion, there you can do further estimations on the thickness. About your conditions, in my experience the distance you are using is  large to get an uniform coating, nevertheless, it depends on your specific conditions... by the way, what material are you trying to deposit? We made ZnOAl..

Dear Pchoudhury,

The following article (poster) may help you to understand the influence of solvent on the film formation in spray pyrolysis technique.

All the best.

Poster Influence of Solvent on the Film Properties of Ultrasonicall...