The properties of a chemical compound is determined by its structure. Therefore it is necessary to know the structure of the precursor, and then later to predict his reaction to the molar mass and concentration.
Molarity, in general affects thickness, but upto certain limit, after increase of thickness, with molarity other effects such as non-adherence, porosity come into picture. If interested, Pl. see attached paper
The molarity of precursor solution has an essential role on microstructural properties of semiconductor oxides films in case of their preparing by the spray pyrolysis technique. It leads also to increase the thickness of prepared films.
Tha molarity of the solution changes various things. For example, if you keep process time constant, the thickness, composition, microstructure and uniformity changes accordingly. If you ask the composition of the constituents and their molar ratio it will affect also additionally composition of the films. If you like you can investigate the following articles.
All the best.
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Nice article. Its very helpful. Effect of Stoichiometry and infuse rate on film properties such as structural, optical, morphological ,compositional and electrical are considerable factors.