Patent ID: 6207487
Filing Date: 2001-03-27
Classification: H01L

Abstract:
A method for forming a dielectric film in a capacitor comprising the steps of:(a) providing a lower electrode having a surface and a rounded protruding portion, said surface and said protruding portion defining at least one concave area;(b) forming a chemisorption layer comprised of at least one atom of the first reactant chemically bonded to the surface of the lower electrode, and a physisorption layer comprised of at least one material of the first reactant physically bonded to the chemisorption layer;(c) removing a portion of the physisorption layer, leaving a portion of the physisorption layer on the concave area; and(d) reacting the chemisorption layer and the portion of the physisorption layer on the concave area with a second reactant to form a dielectric film on the surface of the lower electrode, wherein the thickness of said dielectric film is greater on the concave area than on the protruding portion.