Patent ID: 6768155
Filing Date: 2004-07-27
Classification: H01L

Abstract:
A semiconductor device comprising:a trench formed in a semiconductor substrate, the trench having a sidewall; a capacitor, the capacitor having a node dielectric lining a portion of the sidewall, a buried plate disposed in the semiconductor substrate adjacent to the node dielectric, and capacitor fill material including a dopant, the capacitor fill material being dispose within the trench; an insulator, disposed over at least a part of the capacitor fill material; and a transistor, the transistor having a source, a gate disposed at least partly over the insulator and connected to the source, and a buried strap adjacent to the insulator and the capacitor fill material, the buried strap including a liner and a strap fill material, wherein the buried strap acts as a drain of the transistor and the liner has a first side disposed between the sidewall and the strap fill material and reduces diffusion of the dopant in a direction substantially perpendicular to the sidewall while allowing diffusion of the dopant in a direction substantially parallel to the sidewall.