Patent ID: 7557012
Filing Date: 2009-07-07
Classification: H01L

Abstract:
1. A method for forming a surface strap of a DRAM device, comprising: providing a substrate having thereon a conductive layer and a pad layer on the conductive layer; forming an opening in the pad layer and the conductive layer; forming a capacitor trench into the substrate through the opening; forming a trench capacitor in the capacitor trench, wherein the opening exposes a top surface of a capacitor content of the trench capacitor; forming a conductive connection layer directly on the top surface of the capacitor content within the opening such that the conductive connection layer is in contact with the conductive layer; selectively removing a portion of the conductive connection layer and a portion of the capacitor content, thereby forming a conductive connection strap and a recess thereto; filling the recess with an insulation layer, wherein the insulation layer covers the conductive connection strap; removing the pad layer to expose the conductive layer; and selectively removing the conductive layer to form a first conductive strap that electrically connects with the conductive connection strap, wherein the conductive connection strap and the first conductive strap constitute the surface strap.