Patent ID: 7494891

Claim:
A method of forming a trench capacitor comprising: patterning a bottle shaped trench in a substrate, said bottle shaped trench having an upper portion and a lower portion, wherein said upper portion is adjacent a surface of said substrate and said lower portion is within said substrate, and wherein said upper portion is narrower than said lower portion; forming a node dielectric in said bottle shaped trench; depositing an initial conductor within said lower portion of said bottle shaped trench, such that a void is formed within said initial conductor; after depositing said initial conductor, forming an insulating collar in said upper portion of said bottle shaped trench above said initial conductor; simultaneously etching a center portion of said insulating collar and said initial conductor in a continuous, non-stop process until said void is exposed, wherein said etching forms a center opening within said insulating collar and said initial conductor; and depositing an additional conductor in said center opening such that said additional conductor is formed at least to a level of said surface of said substrate.