Patent ID: 6756626
Filing Date: 2004-06-29
Classification: H01L

Abstract:
A storage capacitor, comprising:a semiconductor substrate formed with a trench having a trench wall, said trench having a lower portion and an upper portion, said trench being a bottle-shaped trench with said lower portion being wider than said upper portion, and said trench wall having an upper and a lower section in said lower portion of said trench, said upper section and said lower section of said lower portion being wider than said upper portion of said trench; an outer electrode layer formed around said lower portion of said trench; a dielectric intermediate layer formed in said lower section of said trench wall; an inner electrode layer substantially filling said trench; and a single uniform thick insulation layer disposed completely on said upper section of said trench wall in said lower portion of said trench, said thick insulation layer adjoining said dielectric intermediate layer, and said thick insulation layer being formed of a material selected from the group consisting of an oxide and a nitride.