Patent ID: 6258660
Filing Date: 2001-07-10
Classification: H01L

Abstract:
A process of forming a container cell comprising:forming an oxide layer upon a semiconductor substrate;forming a nitride layer upon said oxide layer to form a nitride/oxide double layer upon said semiconductor substrate;forming a trench through said nitride/oxide double layer in said semiconductor substrate;forming an isolation film upon said nitride/oxide double layer and within said trench;removing said isolation film upon said nitride/oxide double layer;removing said nitride layer;forming a first gate stack upon said semiconductor substrate having an edge aligned with and adjacent to an edge of said trench;forming a second gate stack upon said isolation film within said trench; andetching a container cell into said isolation film within said trench, said container cell being situated substantially between said first and second gate stacks and having an edge defined by said semiconductor substrate and said isolation film, said edge of same container cell substantially extending to and terminating at each of said first and second gate stacks.