Patent ID: 6159850
Filing Date: 2000-12-12
Classification: H01L

Abstract:
A method of forming an electrically enhanced contact surface in a self-aligned contact window comprising the steps of:providing a substrate having a plurality of gates, wherein each gate has a spacer on each side wall of the gate and a cap layer on the gate;forming an oxide layer over the gates and the substrate;forming a photo-resist layer with an opening on the oxide layer, wherein the opening exposes a part of the oxide layer aligned with a predetermined source/drain region of the substrate between the gates;etching the oxide layer using the photo-resist layer, the spacer and the cap layer as a mask to form the contact window to expose the predetermined source/drain region;etching the predetermined source/drain region by a soft-etching process and forming a recess with a rough surface within the contact window; andperforming an ion implantation to form a charge barrier underlying a top surface of the predetermined source/drain region to prevent charge leakage due to the rough surface of the recess.