Patent ID: 8587047
Filing Date: 2013-11-19
Classification: H01L

Abstract:
1. A capacitor structure for a pumping circuit comprising: a substrate; a bottom electrode formed in said substrate and having an indented portion; a top electrode formed on said substrate and having an extension integrally formed with said top electrode and extended into and mated with said indented portion; a dielectric layer sandwiched between said bottom electrode and said top electrode to isolate said top electrode from said bottom electrode, wherein a horizontal direction of said dielectric layer has a thickness different from that of a vertical direction of said dielectric layer, whereby capacity of said capacitor structure for said pumping circuit is increased due to an additional peripheral contact surface of said indented portion between said top electrode and said bottom electrode; and an inner spaced disposer on part of a sidewall of said vertical direction of said dielectric layer, and spaced apart from the horizontal direction of said dielectric layer, wherein the total length of the inner spacer is longer than the total distance extending directly from the bottom surface of the inner spacer to the topmost surface of the horizontal direction of said dielectric layer.