Dear Dr. Wei Ming En,

following the logic, I believe that much depends on the degree of adhesion of the complex "substrate / double layer / photoresist" system. If the adhesion of the photoresist with the other elements is good, in the case on the left side, the adhesion will be greater because the exploitable surface of "grip" is greater. The resistance of the system will however be conditioned by the mechanical properties of the photoresist which, in this case, has a lower protective thickness.

Best regards, Pierluigi Traverso

Adhesion property depends more on the surface energy of the substrate not on the thickness. A thick film can lead to surface non-uniformity or high roughness but will not affect the adhesion of photo-resist on the substrate

dear Wei Ming En i agree with the opinion of Ishan Choudhary the roughness is more effective on the surface adhesion than thickness

Dear professor Pierluigi Traverso

Thanks for your reply.

In the statement of your reply, can I take the ''exploitable surface of "grip" '' as contact surface?

Dear professor Ishan Choudhary

Thank you for your reply.

How can I increase the surface energy properly to improve the adhesion between the photoresist and my substrate but not harm my substrate?

And the figure is the size and composition of my substrate.

Photoresist will be coated mainly on Chromium thin film, very small amount on the PET, and the pattern on the ZnO film.

Dear Dr. Wei Ming En,

I think so, the idea is that. In general, the adhesion of the top coat is much greater, with the same adhesive power, as the area on which it is applied increases.

Best regars, Pierluigi Traverso

Adhesion of a coating on substrate depends on it's surface energies and other properties may depend on thickness.