Substrate condition for physical vapor deposition coating

Last modified; May 5, 2010

The condition of the substrate surface on which the thin film must be deposited is also a critical issue: no matter how good the deposition conditions and materials are, if the surface of the substrate is contaminated or does not have sufficient roughness, it would be quite difficult to obtain good optical properties.

Moreover, some substrates tend to expel moisture during or after deposition; such substrates should be properly out-gassed before coating.