Capacitor structure and method of manufacture
First Claim
1. A capacitor structure, comprising,a plurality of sub-capacitors stacked on a substrate, each of which comprises a top capacitor plate, a bottom capacitor plate and a dielectric layer sandwiched therebetween;
- anda first capacitor electrode and a second capacitor electrode connecting the plurality of sub-capacitors in parallel,wherein the plurality of sub-capacitors include a plurality of first sub-capacitors and a plurality of second sub-capacitors stacked in an alternate manner, so that each of the first sub-capacitors has a bottom capacitor plate overlapping with a top capacitor plate of an underlying second sub-capacitor, with the overlapping plate being a first electrode layer; and
each of the second sub-capacitors has a bottom capacitor plate overlapping with a top capacitor plate of an underlying first sub-capacitor, with the overlapping plate being a second electrode layer,characterized in;
that the first electrode layer and the second electrode layer are made of different conductive materials;
the second electrode layer is etched from a first side of the capacitor structure to form a first recess;
the first electrode layer is etched from a second side of the capacitor structure to form a second recess; and
the first and second recesses are filled with a dielectric material to insulate the second electrode layer from the first capacitor electrode and the first electrode layer from the second capacitor electrode, respectively.
1 Assignment
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Accused Products
Abstract
The presented application discloses a capacitor structure and a method for manufacturing the same. The capacitor structure comprises a plurality of sub-capacitors formed on a substrate, each of which comprises a top capacitor plate, a bottom capacitor plate and a dielectric layer sandwiched therebetween; and a first capacitor electrode and a second capacitor electrode connecting the plurality of sub-capacitors in parallel, wherein the plurality of sub-capacitors includes a plurality of first sub-capacitors and a plurality of second sub-capacitors stacked in an alternate manner, each of the first sub-capacitors has a bottom capacitor plate overlapping with a top capacitor plate of an underlying second sub-capacitor, with the overlapping plate being a first electrode layer; and each of the second sub-capacitors has a bottom capacitor plate overlapping with a top capacitor plate of an underlying first sub-capacitor, with the overlapping plate being a second electrode layer, the capacitor structure is characterized in that the first electrode layer and the second electrode layers are made of different conductive materials. The capacitor structure has a small footprint on the chip and a large capacitance value, and can be used as an integrated capacitor in an analogous circuit, an RF circuit, an embedded memory, and the like.
8 Citations
9 Claims
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1. A capacitor structure, comprising,
a plurality of sub-capacitors stacked on a substrate, each of which comprises a top capacitor plate, a bottom capacitor plate and a dielectric layer sandwiched therebetween; - and
a first capacitor electrode and a second capacitor electrode connecting the plurality of sub-capacitors in parallel, wherein the plurality of sub-capacitors include a plurality of first sub-capacitors and a plurality of second sub-capacitors stacked in an alternate manner, so that each of the first sub-capacitors has a bottom capacitor plate overlapping with a top capacitor plate of an underlying second sub-capacitor, with the overlapping plate being a first electrode layer; and
each of the second sub-capacitors has a bottom capacitor plate overlapping with a top capacitor plate of an underlying first sub-capacitor, with the overlapping plate being a second electrode layer,characterized in; that the first electrode layer and the second electrode layer are made of different conductive materials; the second electrode layer is etched from a first side of the capacitor structure to form a first recess; the first electrode layer is etched from a second side of the capacitor structure to form a second recess; and the first and second recesses are filled with a dielectric material to insulate the second electrode layer from the first capacitor electrode and the first electrode layer from the second capacitor electrode, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
the second capacitor electrode contacts all of the second electrode layers at the second side opposite to the first side, while being electrically isolated from all of the first electrode layer.
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9. The capacitor structure according to claim 1, wherein the capacitor structure is formed in a shallow trench isolation region.
Specification