Patent ID: 6180522
Filing Date: 2001-01-30
Classification: H01L

Abstract:
A method of forming a contact in a semiconductor device, comprising the steps of:forming an insulating layer on a semiconductor substrate wherein an impurity diffusion region is formed on a predetermined portion of the substrate;forming a contact hole exposing a portion of the impurity diffusion region by removing a predetermined portion of the insulating layer;forming a first conductive layer on the insulating layer and in the contact hole;forming a second conductive layer on the first conductive layer;forming a third conductive layer at an interface between the first conductive layer and the impurity diffusion region;forming a buried layer for preventing ion-diffusion inside the second conductive layer, wherein the buried layer is formed by ion implantation at an energy level of approximately 10 to 30 KeV, and at a dose of approximately 1E15 to 3E15 atoms/cm.sup.2 ;forming a conductive plug filling up the contact hole on a predetermined portion of the second conductive layer; andforming a fourth conductive layer on the second conductive layer wherein the fourth conductive layer is electrically connected to an upper surface of the plug.