Patent ID: 7023042
Filing Date: 2006-04-04
Classification: H01L

Abstract:
1. A capacitor structure comprising: a storage node shape with a first portion of said storage node shape overlying a conductive via structure, wherein said conductive via structure is located in an opening in an insulator layer, and wherein said conductive via structure contacts a source/drain region of an underlying metal oxide semiconductor field effect transistor (MOSFET), and wherein a second portion of said storage node shape overlies portions of a top surface of said insulator layer; said storage node shape having alternate rows of doped regions therein that are aligned horizontally and parallel to the top surface of said insulator layer, and having alternate rows of undoped regions therein that are also aligned horizontally and parallel to the top surface of said insulator layer, with each set of said doped regions separated by a respective one of said undoped regions; said storage node shape further having lateral grooves extending inwards from sides of each said doped region in said storage node shape, and wherein each said undoped region of said storage node shape exhibits smooth, non-groove sides; a capacitor dielectric layer located on a smooth top surface of, and on sides of said storage node shape, and wherein said capacitor dielectric layer conforms to contours of the surfaces of the lateral grooves in each said doped region of said storage node shape; and a conductive upper node structure located over said capacitor dielectric layer.