Stacked capacitor and method for fabricating the same
First Claim
Patent Images
1. A stacked capacitor on a contact plug of a semiconductor substrate, comprising:
- a cylindrical conductive layer as a lower electrode of the stacked capacitor, wherein an opening is in the cylindrical conductive layer;
a barrier layer inside the opening of the cylindrical conductive layer and filling a portion of the opening;
a capacitor dielectric layer on the cylindrical conductive layer and the barrier layer; and
an upper electrode layer on the capacitor dielectric layer.
1 Assignment
0 Petitions
Accused Products
Abstract
A stacked capacitor on a contact plug of a semiconductor substrate and the method for fabricating the same. A cylindrical conductive layer is formed upon a contact plug of a semiconductor substrate as a lower electrode of a stacked capacitor and there is an opening in the cylindrical conductive layer. A barrier layer is deposited inside the opening of the cylindrical conductive layer and fills a portion of the opening. A capacitor dielectric layer is deposited on the cylindrical conductive layer and on the barrier layer and an upper electrode layer is formed on the capacitor dielectric layer to complete the stacked capacitor.
53 Citations
33 Claims
-
1. A stacked capacitor on a contact plug of a semiconductor substrate, comprising:
-
a cylindrical conductive layer as a lower electrode of the stacked capacitor, wherein an opening is in the cylindrical conductive layer;
a barrier layer inside the opening of the cylindrical conductive layer and filling a portion of the opening;
a capacitor dielectric layer on the cylindrical conductive layer and the barrier layer; and
an upper electrode layer on the capacitor dielectric layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A stacked capacitor on a contact plug of a semiconductor substrate, comprising:
-
a cylindrical conductive layer as a lower electrode of the stacked capacitor, wherein an opening is in the cylindrical conductive layer;
a barrier layer lining the lower portion and bottom of the opening of the cylindrical conductive layer;
a capacitor dielectric layer on the cylindrical conductive layer and the barrier layer; and
an upper electrode layer on the capacitor dielectric layer. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method of fabricating a stacked capacitor, comprising the steps of:
-
(a) providing a semiconductor substrate comprising a first insulating layer thereon and a contact plug embedded in the first insulating layer;
(b) forming a second insulating layer an a third insulating layer on the semiconductor substrate in sequence;
(c) removing a portion of the second insulating layer and the third insulating layer to form an opening and exposing the contact plug by lithography and etching;
(d) depositing a first barrier layer and a first conductive layer in sequence on the opening and the third insulating layer;
(e) depositing a second barrier layer on the first conductive layer and recessing the second barrier layer untill the surface of the second barrier layer is below the top of the opening;
(f) removing the first conductive layer beyond the opening and forming a cylindrical conductive layer in the opening as a lower electrode of the stacked capacitor;
(g) recessing the third insulating layer and the first barrier layer untill the second insulating layer is exposed;
(h) forming a capacitor dielectric layer on the second barrier and the cylindrical conductive layer; and
(i) forming an upper electrode layer on the capacitor dielectric layer. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
-
Specification