Patent ID: 8044497

Claim:
An assembly comprising: first and second semiconductor die structures each including a semiconductor having a front side and a backside; an active region on the front side, the active region including a plurality of transistors, the active region also including a plurality of layers including metal regions and dielectric regions; the backside including metal regions formed thereon; the transistors being positioned between the backside metal regions and at least one of the layers in the active region on the front side; a plurality of vias in each of the first and second semiconductor die structures, the vias including electrically conductive material therein that forms electrical connections between the active region and the backside metal regions, the vias extending through the semiconductor from the front side to the backside; and the first and second semiconductor die structures being stacked together with at least one of the metal regions on the backside of the first semiconductor die structure in direct contact with at least one of the metal regions on the back side of the second semiconductor die structure.