Patent ID: 6821837
Filing Date: 2004-11-23
Classification: H01L

Abstract:
A method for manufacturing a trench capacitor having a storage node and an electrode, comprising:forming a trench within a substrate; doping the substrate to form a first conductive area; forming a first dielectric layer to electrically insulate the first conductive area; forming a second conductive layer contiguous with the first dielectric layer; forming a second dielectric layer contiguous with the second conductive layer; removing a bottom portion of the first dielectric layer, the second conductive layer, and the second dielectric layer; forming a third conductive layer in the trench to electrically couple to the first conductive area; electrically insulating the third conductive layer; removing an upper sidewall portion of the first dielectric layer, the second conductive layer, the second dielectric layer, and the third conductive layer; forming a fifth dielectric layer on an upper sidewall of the trench; forming a fourth conductive layer in a lower portion of the trench; and forming a fifth conductive layer on the fourth conductive layer in the trench to electrically couple the fourth conductive layer and the second conductive layer.