Patent ID: 7879711

Claim:
A method of forming a semiconductor device, comprising the steps of: forming at least one transistor gate over a first substrate and at least one first conductive structure within the first substrate; forming an interlayer dielectric (ILD) layer over the gate transistor, the ILD layer comprising at least one contact structure formed therein and making electrical contact with the transistor gate and at least one second conductive structure and making electric contact with the first conductive structure; forming a first passivation layer over the ILD layer, the first passivation layer comprising at least one first pad structure formed therein, wherein the first pad structure makes electrical contact with the second conductive structure; bonding the first substrate with a second substrate; removing at least a portion of the first conductive structure; and forming a second passivation layer over a bottom surface of the first substrate, the second passivation layer comprising at least one second pad structure formed therein, wherein the second pad structure makes electrical contact with the first conductive structure.