Patent ID: 6090656
Filing Date: 2000-07-18
Classification: H01L

Abstract:
A method for forming a metal-to-polysilicon capacitor, in and on a silicon substrate, on an integrated circuit having MOSFET devices, comprising:forming a field oxide layer on the substrate;forming a polysilicon segment on the field oxide layer;forming a first dielectric layer on the field oxide layer and the polysilicon segment, wherein an opening is present in the first dielectric layer to expose a portion of the polysilicon segment;doping a portion of the polysilicon segment through the opening;forming a second dielectric layer on the polysilicon segment exposed in the opening and on the first dielectric layer wherein a portion of the polysilicon segment is out of contact with the second dielectric layer;forming a contact to the portion of the polysilicon segment out of contact with the second dielectric layer; andforming a metal segment on the second dielectric layer over the opening, wherein the metal segment forms a top-plate for the metal-to-polysilicon capacitor and polysilicon segment forms a bottom-plate for the metal-to-polysilicon capacitor.