Patent ID: 6417063
Filing Date: 2002-07-09
Classification: H01L

Abstract:
A method for forming a deep trench capacitor, including a node dielectric formed in a lower portion of the deep trench and a collar formed in an upper portion of the deep trench, the deep trench being filled with a conductive material to form a storage node, comprising the steps of:forming a center trench into the storage node, the center trench being centrally disposed within the storage node; depositing a center node dielectric layer in the center trench; filling the center trench with the conductive material to form a center node separated from the storage node by the center node dielectric layer; forming a hole to expose a portion of the center node and a portion of a substrate surrounding the deep trench, the hole also exposing a portion of the storage node; forming a dielectric cap on the portion of the storage node exposed in the hole; and depositing conductive material in the hole to connect the center node to a buried plate surrounding the lower portion of the deep trench.