Patent ID: 7776706
Filing Date: 2010-08-17
Classification: H01L

Abstract:
1. A method of forming a trench memory cell, the method comprising: forming a trench capacitor within a substrate material, the trench capacitor including a node dielectric layer formed within a trench and a conductive capacitor electrode material formed within the trench in contact with the node dielectric layer; forming a strap mask so as to cover one side of the trench and expose one side of the capacitor electrode material formed within the trench, recessing the exposed side of the capacitor electrode material and removing a portion of the node dielectric layer exposed by the recessing of the capacitor electrode material using the strap mask; and forming a conductive buried strap material within the trench by filling a volume of the trench vacated by the removed portion of the node dielectric layer and recessed capacitor electrode material with the conductive buried strap material so as to define a single-sided buried strap within the trench; wherein the single-sided buried strap is configured in a manner such that the deep trench capacitor is electrically accessible at only one side of the trench.