Patent ID: 7851326
Filing Date: 2010-12-14
Classification: H01L

Abstract:
1. A method for producing deep trench structures in an STI structure of a semiconductor substrate, the method comprising: providing at least one STI recess into a respective at least one portion of said semiconductor substrate; providing materials to form an active region on a second portion of said semiconductor substrate; introducing a first filler material to provide full-area filling of each of said at least one STI recess and to cover said active region to form a semiconductor structure; subjecting a first surface of said semiconductor structure to a CMP process to level said first filler material and produce the STI structure, wherein the STI structure is a level planar surface across the entirety of the full-area filling and the active region; and etching at least one deep trench, using the leveled STI structure as a hard mask, in an area of the STI structure to create the deep trench structures.