Patent ID: 8586465

Claim:
A method of packaging comprising: providing n number of dies of a die stack, wherein a die of the die stack includes first and second major surfaces, a mask layer with a mask opening on the first major surface, and a through via contact having a via portion which extends from the first to the second major surface and an upper portion disposed in the mask opening, wherein the through via contact is formed by reflowing a first conductive material disposed in the mask opening to cause it to flow into a via in communication with the mask opening to form the via portion of the through via contact while the upper portion partially fills the mask opening and contacts inner walls of the mask opening while leaving a space therein; stacking the n number of dies to form the die stack, wherein a bottom die of the die stack is the first die and a top die of the die stack is the n th die, the n number of dies of the die stack are stacked such that the mask of a die below (i th −1 die) contacts the second surface of a die above (i th die), wherein the through via contact of the die above is aligned with the partially filled mask opening of the die below; and reflowing the first conductive material of the through via contacts of the die stack, wherein the space of the partially filled mask opening of the i th −1 die is completely filled by the reflowed conductive material of the through via contact of the i th die to form connections between the dies of the die stack.