Patent ID: 6236077
Filing Date: 2001-05-22
Classification: H01L

Abstract:
A deep trench capacitor in a monocrystalline semiconductor substrate, the capacitor comprising (i) a buried plate in the substrate about an exterior portion of a trench in the substrate, (ii) a node dielectric about at least a lower interior portion of the trench, (iii) an oxide collar about an upper interior portion of the trench, (iv) an electrode in the trench, the electrode comprising a lower region at or below a lower edge of said collar and extending to said node dielectric and an intermediate electrode region extending upward from the lower electrode region, and (v) a conductive strap extending away from the trench electrode intermediate region, the conductive strap being electrically connected to the trench electrode and the monocrystalline substrate, the capacitor further comprising (vi) a conductive barrier layer between the lower and intermediate regions of the trench electrode.