Patent ID: 7968403
Filing Date: 2011-06-28
Classification: H01L

Abstract:
1. A method of fabricating a sleeve insulator for a contact structure in an integrated circuit, comprising: forming a semiconductor substrate having a capacitor storage node thereon, a contact plug on the semiconductor substrate, a lower bulk insulator material upon the semiconductor substrate, a capacitor dielectric material upon the lower bulk insulator material and upon the capacitor storage node, a cell plate conductor material upon the capacitor dielectric material, and a cell plate insulator material having a top surface overlying the cell plate conductor material; removing portions of the cell plate insulator material, the cell plate conductor material, the capacitor dielectric material and the lower bulk insulator material to form an opening extending into the lower bulk insulator material and terminating at a bottom surface defined by the lower bulk insulator material above the semiconductor substrate; forming a sleeve insulator material overlying and contacting the top surface of the cell plate insulator material, sidewalls of each of the cell plate insulator material, the cell plate conductor material, the capacitor dielectric material, the lower bulk insulator within the opening, and the bottom surface defined by the lower bulk insulator within the opening; and removing a portion of the sleeve insulator material to expose the bottom surface defined by the lower bulk insulator material above the semiconductor substrate, to expose the top surface of the cell plate insulator material, and to render a first terminus of the sleeve insulator material substantially coplanar with the top surface of the cell plate insulator material and a second terminus of the sleeve insulator material opposite the first terminus extending below the capacitor dielectric material and into the lower bulk insulator material above the semiconductor substrate.