Patent ID: 8674515
Filing Date: 2014-03-18
Classification: H01L

Abstract:
1. A 3D integrated circuit comprising: a first integrated circuit having a connection pad mechanically and electrically joined to a second integrated circuit having a connection pad and a single metal-filled via making simultaneous connection with the first integrated circuit connection pad and the second integrated circuit connection pad wherein the single via within the first integrated circuit has a center portion, two ends and a width within the first integrated circuit which is narrower in the center portion than at the two ends and wherein one of the ends of the single via has a first thickness portion and a second thickness portion such that the second thickness portion is greater in thickness than the first thickness portion and the second thickness portion of the one of the ends of the single via has a surface facing the second integrated circuit such that the surface facing the second integrated circuit makes direct contact with the connection pad in the first integrated circuit.