Patent ID: 6169016
Filing Date: 2001-01-02
Classification: H01L

Abstract:
A method of forming contact, used on a substrate having gates formed thereon and source/drain regions in the substrate and beside the gates, wherein one of the source/drain regions is used as a common source/drain region between the gates, the method comprising the steps of: forming a dielectric layer on the substrate and the gates; respectively forming a contact opening in the dielectric layer to each of the source/drain regions; forming a first polysilicon layer on the contact opening window surface and on the dielectric layer; performing an ion implantation process with an energy in a range of 20-30 KeV; forming a lightly doped, second polysilicon layer on the first polysilicon layer and in the contact opening and without first performing a native oxide removing process; and defining the first polysilicon layer and the second polysilicon layer and leaving the first polysilicon layer and the second polysilicon layer in the contact opening to form a contact.