Patent ID: 6222245
Filing Date: 2001-04-24
Classification: H01L

Abstract:
A high-capacitance capacitor which can be integrated monolithically on a semiconductor substrate doped with a first type of dopant, the high-capacitance capacitor comprising:a first diffusion well contained within the substrate, the diffusion well being doped with a second type of dopant and formed with a first active region therein;a gate oxide layer being deposited onto the diffusion well;a first layer of polycrystalline silicon that covers the gate oxide layer;a second layer of polycrystalline silicon; anda dielectric layer that separates the first and second layers of polycrystalline silicon, wherein the first and second layers of polycrystalline silicon form conductive plates of a first elementary capacitor, wherein the dielectric layer forms an isolation dielectric of the first elementary capacitor, wherein the first layer of polycrystalline silicon and the first diffusion well form conductive plates of a second elementary capacitor, and wherein the gate oxide layer forms an isolation dielectric of the second elementary capacitor;wherein the first layer of polycrystalline silicon includes a first contact terminal of the high-capacitance capacitor, wherein the second layer of polycrystalline silicon includes a second contact terminal of the high-capacitance capacitor, and wherein the active region includes a third contact terminal of the high-capacitance capacitor;wherein the second layer of polycrystalline silicon includes a first portion and a second portion which are structurally independent and separated from each other.