Patent ID: 9596768
Date: 2017-03-14
CPC Classifications: H01L,H05K

Claim:
1. A device, comprising: a substrate having a first surface and a second surface opposite the first surface, the substrate including a plurality of vias extending from the first surface to the second surface; a dielectric polymer layer on the first and second surfaces of the substrate and lining the plurality of vias; a plurality of metal conductors corresponding to the plurality of vias, each metal conductor extending from the first surface to the second surface of the substrate through the corresponding via; a first plurality of pads adjacent the first surface and a second plurality of pads adjacent the second surface; and a seed layer on the dielectric polymer layer such that the seed layer is between each of the plurality of metal conductors and each portion of the dielectric polymer layer lining the via corresponding to that metal conductor, between each of the first plurality of pads and each portion of the dielectric polymer layer on the first surface corresponding to that first pad, and between each of the second plurality of pads and each portion of the dielectric polymer layer on the second surface corresponding to that second pad, wherein in between two adjacent vias, there is no seed layer on each of one or more portions of the dielectric polymer layer not covered by the plurality of metal conductors, not covered by the first plurality of pads, and not covered by the second plurality of pads.