Patent ID: 7528053

Claim:
A method of making a three-dimensional package, comprising the following steps: (a) providing a wafer, having a first surface and a second surface, the first surface having at least one pad and a protection layer exposing the pad; (b) forming at least one blind hole on the first surface of the wafer; (c) forming an isolation layer on the side wall of the blind hole; (d) forming a conductive layer covering the pad, the protection layer, and the isolation layer; (e) forming a dry film on the conductive layer, wherein the dry film has an opening at the position corresponding to the blind hole; (f) filling the blind hole with a metal; (g) removing the dry film, and patterning the conductive layer; (h) removing a part of the metal in the blind hole, so as to form a space; (i) removing a part of the second surface of the wafer and a part of the isolation layer, so as to expose a part of the conductive layer; (j) forming a solder on the lower end of the conductive layer, wherein the melting point of the solder is lower than that of the metal; (k) stacking a plurality of the wafers, and performing a reflow process; and (l) cutting the stacked wafers, so as to form a plurality of three-dimensional package structures.