Improvement of plating adhesion on PhotoVia substrates

This paper deals with the microvia substrates. Microvia substrates are high density multilayer printed circuits boards with the reduced diameter of interconnection vias. PhotoVia method was used for the creation of microvias by photolithography. For this method, the photoimageable dielectric materials have to be used. This report deals with special composite photodielectrics. Unlike the convention photosensitive dielectrics, these materials do not require any special surface treatment due to the adhesion improvement. Experiments with variable quantity of ceramic filler were executed. Roughness of dielectric surface and adhesion of conductive layer were measured.