Hi all, I am studying ZnO and Al-doped ZnO (AZO) for transparent conductive thin film applications. I synthesized ZnO and AZO nanoparticles (NPs) by wet chemical method, then fabricated the thin film on glass substrate by spin-coating technique, and finally, annealed at high temperature. To make the thin film with high quality, uniformity, and having good links with substrate, it is important to treat the glass substrate surface in a correct way (before spin-coating). Unfortunately, I have only very little information regarding this technique. Please help me by bringing out your experience and suggestion on this matter, thanks!