Method for manufacturing a capacitor in a semiconductor device using selective tungsten nitride thin film
First Claim
Patent Images
1. A method of manufacturing a capacitor in a semiconductor device, comprising the steps of;
- sequentially forming a first insulating layer and a second insulating layer over a semiconductor substrate;
patterning the first insulating layer and the second insulating layer to form a first contact hole exposing a portion of the semiconductor substrate;
forming a first conductive layer over the second insulating layer to fill the first contact hole and electrically contact the exposed portion of the semiconductor substrate;
patterning the first conductive layer to form a lower portion of a first capacitor electrode;
forming a third insulating layer over the lower portion of the first capacitor electrode;
patterning the third insulating layer to form a second contact hole exposing a portion of the lower portion of the first capacitor electrode, the second contact hole being surrounded by residual portions of the third insulating layer;
forming an upper portion of the first capacitor electrode on the exposed portion of the lower portion of the first capacitor electrode by selectively forming a second conductive layer pattern on bottom and side wall surfaces of the second contact hole;
removing the residual portions of the third insulating layer;
removing the second insulating layer to form an undercut beneath the lower portion of the first capacitor electrode;
forming a dielectric film over the first capacitor electrode; and
,forming a second electrode over the dielectric film.
1 Assignment
0 Petitions
Accused Products
Abstract
There is provided a method for manufacturing a capacitor in a semiconductor device including the steps of forming first and second insulating layers with a first contact hole through to a semiconductor substrate, patterning a first conductive layer to form a pedestal portion of a lower electrode, using a patterned third insulating layer selectively forming an upper portion of the lower electrode from a tungsten nitride thin film, and forming an undercut beneath the pedestal portion by wet-etching the second insulating layer.
84 Citations
18 Claims
-
1. A method of manufacturing a capacitor in a semiconductor device, comprising the steps of;
-
sequentially forming a first insulating layer and a second insulating layer over a semiconductor substrate; patterning the first insulating layer and the second insulating layer to form a first contact hole exposing a portion of the semiconductor substrate; forming a first conductive layer over the second insulating layer to fill the first contact hole and electrically contact the exposed portion of the semiconductor substrate; patterning the first conductive layer to form a lower portion of a first capacitor electrode; forming a third insulating layer over the lower portion of the first capacitor electrode; patterning the third insulating layer to form a second contact hole exposing a portion of the lower portion of the first capacitor electrode, the second contact hole being surrounded by residual portions of the third insulating layer; forming an upper portion of the first capacitor electrode on the exposed portion of the lower portion of the first capacitor electrode by selectively forming a second conductive layer pattern on bottom and side wall surfaces of the second contact hole; removing the residual portions of the third insulating layer; removing the second insulating layer to form an undercut beneath the lower portion of the first capacitor electrode; forming a dielectric film over the first capacitor electrode; and
,forming a second electrode over the dielectric film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 12, 13, 14)
-
- 8. The method of 6, wherein the deposition gas is one selected from a group consisting of WF6 and WCl6.
- 9. The method of 7, wherein the deposition gas is one selected from a group consisting of WF6 and WCl6.
-
15. A method for manufacturing a capacitor, comprising the steps of:
-
forming a first insulating layer over a semiconductor substrate; patterning the first insulating layer to form a first contact hole exposing a portion of the semiconductor substrate; forming a first conductive layer over the first insulating layer to fill the first contact hole; forming a second insulating layer over the first conductive layer; patterning the second insulating layer to form a second contact hole exposing a portion of the first conductive layer, the second contact hole being surrounded by residual portions of the second insulating layer; selectively forming a second conductive layer pattern on bottom and side wall surfaces of the second contact hole; removing the residual portions of the second insulating layer; forming an undercut beneath the second conductive layer pattern by wet-etching the first conductive layer using the second conductive layer pattern as a mask, the combination of the second conductive layer pattern and wet-etched first conductive layer forming a first capacitor electrode; forming a dielectric film over the first capacitor electrode; and
,forming a second capacitor electrode on the dielectric film. - View Dependent Claims (16, 17, 18)
-
Specification