Patent ID: 7943473

Claim:
A method of making a trench capacitor comprising: a) etching a first trench in a substrate from a first surface of the substrate, the first trench having a first region and a second region that is narrower than the first region; b) coating the first surface of the substrate and the first trench with an insulator; c) coating the insulator on the first surface of the substrate and the first trench with a conductor, the conductor together with the insulator filling the second region of the trench but not filling the first region of the trench; d) coating the conductor with an insulator and coating the insulator with a coating of metal at least once more the last coating of the conductor filling the first region of the trench e) chemical-mechanical polishing the first surface of the substrate to remove all the conductor and the insulator coatings on the first surface of the substrate to expose all the edges of the insulator and the conductor coatings in the first trench for providing interconnects thereto.