Patent ID: 6022775
Filing Date: 2000-02-08
Classification: H01L,Y10S

Abstract:
A method of forming a capacitor plate, comprising the steps of:providing a substrate;forming a layer of first dielectric on said substrate;forming a contact hole in said layer of first dielectric;forming a layer of first polysilicon on said layer of first dielectric thereby filling said contact hole in said layer of first dielectric with said first polysilicon;patterning said layer of first polysilicon thereby forming a first polysilicon node over said contact hole;depositing a layer of titanium on said substrate covering said first polysilicon node;reacting that part of said layer of titanium on said first polysilicon node with said first polysilicon node by means of a first anneal thereby forming a layer of titanium silicide on said first polysilicon node;etching away unreacted titanium after performing said first anneal;forming agglomerated titanium silicide from said layer of titanium silicide by means of a second anneal thereby leaving exposed first polysilicon on the surface of said first polysilicon node;etching said exposed first polysilicon on said surface of said polysilicon node using said agglomerated titanium silicide as a mask thereby increasing the surface area of said first polysilicon node and forming a first capacitor plate;forming a layer of second dielectric on said first polysilicon node after etching said exposed first polysilicon on said surface of said first polysilicon node;forming a layer of second polysilicon on said substrate wherein said layer of second polysilicon covers said layer of second dielectric; andpatterning said layer of second polysilicon thereby forming a second capacitor plate on said layer of second dielectric.