Patent ID: 7465640
Filing Date: 2008-12-16
Classification: H01L

Abstract:
1. A method for fabricating a trench capacitor, comprising: forming a trench in a substrate; forming a first capacitor dielectric layer on a surface of said trench; forming a conducting layer inside said trench; after forming the conducting layer, directly forming a second capacitor dielectric layer on a surface of said substrate and on said conducting layer, wherein said substrate around said first and second capacitor dielectric layers serves as a bottom electrode, and said second capacitor dielectric layer is a silicon oxide/silicon nitride/silicon oxide (ONO) tacked layer or a silicon nitride/silicon oxide (NO) stacked layer; forming a protruding electrode on said substrate, said protruding electrode being on said substrate around said trench, covering a junction between said trench and said substrate, and exposing a portion of said conducting layer; and electrically connecting said protruding electrode and said conducting layer, said conducting layer and said protruding electrode being an upper electrode.