Patent ID: 9084341
Filing Date: 2015-07-14
Classification: H01L,H05K,Y10T

Abstract:
1. A fabrication method of a packaging substrate, comprising the steps of: providing two core layers each having a first surface having a first metal layer formed thereon and a second surface opposite to the first surface and having a second metal layer formed thereon, and a plurality of through holes penetrating through the first metal layer and the first surface of the core layer so as to expose portions of the second metal layer; bonding the second metal layers of the two core layers together through an adhesive member for connecting the two core layers; using the first metal layer of each of the core layers to form a first circuit layer having a plurality of first conductive pads on the first surface of the core layer and form conductive through holes in the through holes of the core layer for electrically connecting the first circuit layer; forming first insulating protection layers on the first surfaces of the core layers and the first circuit layers, each of the first insulating protection layers having a plurality of openings for exposing the first conductive pads so as for a first surface finish layer to be formed on the exposed first conductive pads; attaching a carrier to each of the first insulating protection layers through an adhesive layer; removing the adhesive member so as to obtain two substrate bodies; stacking the carriers of the two substrate bodies on one another by using a bonding member so as to expose the second metal layers; using the second metal layer of each of the core layers to form a second circuit layer having a plurality of second conductive pads and electrically connecting the conductive through holes; forming second insulating protection layers on the second surfaces of the core layers and the second circuit layers, each of the second insulating protection layers having a plurality of openings for exposing the second conductive pads so as for a second surface finish layer to be formed on the exposed second conductive pads, thereby forming two packaging substrates; and removing the bonding member so as to separate the two packaging substrates from each other.