Patent ID: 6017790
Filing Date: 2000-01-25
Classification: H01L

Abstract:
A method of manufacturing an embedded dynamic random access memory DRAM), comprising:providing a substrate that has a memory circuit region and a logic circuit region, wherein the memory circuit region has a plurality of transfer field effect transistors (transfer FETs) with each transfer FET having a first and a second source/drain region and a first gate electrode, and the logic circuit region has a plurality of logic field effect transistors (logic FETs) with each logic FET having a third and a fourth source/drain region and a second gate electrode;forming a first insulating layer over the substrate;patterning the first insulating layer to form a plurality of first and second openings above the memory circuit region and a plurality of third openings above the logic circuit region, wherein each first and second opening exposes the respective first and second source/drain regions of each transfer FET, and each third opening exposes at least one of the conductive regions in the logic circuit region;forming a first conductive layer above the first insulating layer so that it covers the first, the second and the third openings without completely filling them;forming a refractory metal oxide layer over the first conductive layer;forming a mask layer above the refractory metal oxide layer, the mask layer at least covering the first openings and at least exposing the second openings and the third openings;performing a hydrogen treatment so that the exposed refractory metal oxide layer is converted to an electrically conductive layer;removing the mask layer;forming a second conductive layer above the refractory metal oxide layer; andpatterning the second conductive layer, the refractory metal oxide layer and the first conductive layer to form respectively an upper electrode, a dielectric layer and a lower electrode of a capacitor above each first opening, and forming a first and a second contact interconnect above each second and third opening.