Devices and methods for preventing capacitor leakage
First Claim
Patent Images
1. A semiconductor device, comprising:
- a contact plug having a top flange protruding from a main portion of the contact plug, wherein a cross section of the top flange is narrower than a cross section of the main portion of contact plug; and
a capacitor landing on the contact plug with an overlay shift, comprising a bottom electrode on the contact plug, a capacitor dielectric on the bottom electrode, and a top electrode on the capacitor dielectric, with the top flange of the contact plug fitting against the capacitor,wherein the capacitor is formed in a capacitor opening having a bottommost surface, andwherein a portion of the bottommost surface of the capacitor opening that overlays a top recess of the contact plug is level with the rest of the bottommost surface of the capacitor opening that does not overlay the top recess of the contact plug.
0 Assignments
0 Petitions
Accused Products
Abstract
Devices and methods for preventing capacitor leakage caused by sharp tip. The formation of sharp tip is avoided by a thicker bottom electrode which fully fills a micro-trench that induces formation of the sharp tip. Alternatively, formation of the sharp tip can be avoided by recessing the contact plug to substantially eliminate the micro-trench.
16 Citations
7 Claims
-
1. A semiconductor device, comprising:
-
a contact plug having a top flange protruding from a main portion of the contact plug, wherein a cross section of the top flange is narrower than a cross section of the main portion of contact plug; and a capacitor landing on the contact plug with an overlay shift, comprising a bottom electrode on the contact plug, a capacitor dielectric on the bottom electrode, and a top electrode on the capacitor dielectric, with the top flange of the contact plug fitting against the capacitor, wherein the capacitor is formed in a capacitor opening having a bottommost surface, and wherein a portion of the bottommost surface of the capacitor opening that overlays a top recess of the contact plug is level with the rest of the bottommost surface of the capacitor opening that does not overlay the top recess of the contact plug. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification