US Patent 7902674 Three-dimensional die-stacking package structure

This invention provides a substrate having at least one bottom electrode formed therein. A plurality of dice each having at least one opening formed therein are vertically stacked together one by one by a polymer insulating layer acting as an adhering layer between them, along with the openings thereof aligned to each other to form a through hole passing through said dice. The stacked dice are joined to a bottom of the substrate with the polymer insulating layer acting as an adhering layer, making the bottom electrode of the substrate contact the through hole. An electroplating process is performed with the bottom electrode serving as an electroplating electrode to form a conductive contact passing through the dice.