Patent ID: 6197629
Filing Date: 2001-03-06
Classification: H01L

Abstract:
A method for fabricating a poly-load for SRAM constructed on a semiconductor substrate, the method comprising the steps of:forming a gate over the substrate;forming an insulating layer over the substrate, which covers all the exposed surfaces of the gate and the substrate;forming a via hole in the insulating layer to expose the gate;forming a polysilicon layer over the insulating layer;performing an ion-implantation process to dope an impurity element into the entire polysilicon layer to form a lightly doped polysilicon layer;depositing a dielectric layer over the lightly doped polysilicon layer;forming a mask layer over the dielectric layer, which masks a first part of the lightly-doped polysilicon layer that is predefined to be formed into the poly-load while unmasking a second part of the lightly-doped polysilicon layer that is predefined to be formed into a conductive interconnecting line;removing the part of the dielectric layer that is laid directly over the second part of the lightly doped polysilicon layer;forming a metal silicide layer over the second part of the lightly doped polysilicon layer to serve as the conductive interconnecting line;depositing an ILD layer to cover all the exposed surfaces of the dielectric layer and the metal silicide layer; andperforming a densification process on the ILD layer.