Patent ID: 7193262

Claim:
A decoupling capacitor (decap) structure formed in a semiconductor substrate having a trench insulator structure formed therein, said decap comprising: a capacitor trench formed in said trench insulator structure, said capacitor trench of less width than a width of said trench insulator structure and extending into said substrate, said capacitor trench having a capacitor dielectric layer lining the sidewalls and bottom of said capacitor trench; an inner decap electrode formed of a doped semiconductor material deposited in said capacitor trench; and an outer decap electrode comprising doped semiconductor material regions formed adjacent said capacitor trench beneath said trench insulator structure in said substrate; an active region of like conductivity as said doped semiconductor material regions formed adjacent said trench insulator structure and contacting said outer decap electrode; and a contact structure formed atop said inner decap electrode for electrically connecting said inner decap electrode to a first formed metal level and, another contact structure formed atop said active regions of like conductivity for electrically connecting said outer decap electrode to a second formed metal level.