Patent ID: 6977204
Filing Date: 2005-12-20
Classification: H01L,Y10S

Abstract:
1. A method for forming a contact plug in a semiconductor device, comprising the steps of: forming a contact isolation layer on a substrate, the contact isolation layer having an opening exposing a partial portion of the substrate; depositing a conductive layer within the opening of the contact isolation layer; doping dopants in a manner to allow the conductive layer to have different doping distributions with respect to a thickness; and forming a contact plug within the opening through a planarization process applied to the conductive layer, wherein the step of doping the dopants further includes: a first step of doping the dopants until reaching a target deposition thickness by gradually increasing a concentration of the dopants from a first concentration to a second concentration for an interval between an initial conductive layer deposition and the target deposition thickness; and a second step of doping the dopants in a manner that the second concentration is consistently maintained throughout for an interval from the target deposition thickness to a complete deposition thickness.