Patent ID: 6362506
Filing Date: 2002-03-26
Classification: H01L

Abstract:
A word line structure for a dynamic random access memory (DRAM) cell, said structure comprising:(a) a generally planar substrate; (b) a plurality of mesa-shaped active regions formed on said substrate and protruding outwardly a given distance therefrom, said mesa-shaped active regions having outer surfaces at said given distance from said substrate, each of said outer surfaces having two word-line-receiving regions formed therein, each of said word-line-receiving regions having a floor portion; (c) a plurality of substantially straight and parallel word lines each having inner and outer surfaces, two of said plurality of word lines being embedded in said two word-line-receiving regions formed in said outer surfaces of said mesa-shaped active regions with said inner surfaces of said word lines located inwardly of said outer surfaces of said mesa-shaped active regions and adjacent to said floor portions; and (d) an insulation layer positioned on said substrate and having an insulation layer thickness, said insulation layer forming a plurality of isolation regions between said plurality of mesa-shaped active regions, said isolation regions having outer edges located outwardly from said floor portions of said word-line-receiving regions formed in said outer surfaces of said mesa-shaped active regions at a given boundary formed by a given one of said mesa-shaped active regions, a given one of said isolation regions, and a given one of said word lines.