It depends on the material which you want to synthesis. Low temperature wet chemical synthesis with proper surfactant is one of the best ways to synthesis the metal oxides and II-VI semiconductor nano particles with controlled size and shape. For your material, you have to optimise the conditions like, type of surfactant, its concentration and all, to have better product. All the best.
Normally thin films would have lower defect density and hence lower electron/hole traps. In solar cells, interfaces play a major role, so often nanoparticles are not very suitable (except in dye sensitized solar cells where we use the large surface area of nanoparticulate films to increase light absorption and hence exciton generation).
I just forgot to mention that the thin film of the wet chemical synthesised nano particle can be made by spin coating and the size and shapes of nano particles can be further modified by rapid thermal annealing (RTA) process at different time intervals. The RTA process is quite good to tune the size of the nano particle coated on the substrates.
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