Electrode structure including encapsulated adhesion layer
First Claim
1. A multilayer metalized structure comprising:
- a first adhesion layer of a first metal deposited on a substrate;
a second encapsulation layer of a second metal deposited upon the first layer, such that the second layer covers all edges of the first layer not in contact with the substrate.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to methods for forming metalized structures, such as electrodes, on non-conductive substrates of electronic and electro-optic devices for enhanced corrosion resistance. In the method of the present invention, an electrode layer is deposited over an adhesion layer on a substrate surface including all edges of the adhesion layer not in contact with the substrate, thereby encapsulating the adhesion layer within the electrode metal before forming the electrode. Prior art multi-layer metalized structures have a galvanic corrosion problem when exposed to moisture, owing to the differences in electrochemical potentials of the dissimilar metals. Galvanic corrosion cells are created at areas of water condensation during device service. Such galvanic corrosion can cause current leakage, short circuit, or other problems causing device failures. By encapsulating all surfaces of the adhesion layer not in contact with the substrate, in accordance with the present invention, galvanic corrosion can be prevented.
-
Citations
11 Claims
-
1. A multilayer metalized structure comprising:
-
a first adhesion layer of a first metal deposited on a substrate;
a second encapsulation layer of a second metal deposited upon the first layer, such that the second layer covers all edges of the first layer not in contact with the substrate. - View Dependent Claims (2, 3, 4)
-
-
5. A multilayer electrode structure on a semiconductor device comprising:
-
a first adhesion layer of a first metal deposited on a substrate;
a second encapsulation layer of a second metal deposited upon the first layer, such that the second layer covers all edges of the first layer not in contact with the substrate;
an electrode layer of the second metal covering the encapsulation layer. - View Dependent Claims (6, 7, 8)
-
-
9. A method of forming a metalized structure on a substrate comprising the steps of:
-
depositing an adhesion layer of a first metal on a surface of the substrate;
etching the adhesion layer selectively to define contact areas;
depositing an encapsulation layer of a second metal on the surface of the substrate and upon the adhesion layer, such that the encapsulation layer covers all edges of the adhesion layer not in contact with the substrate;
fabricating a metalized structure over the encapsulation layer in the contact areas, the metalized structure being formed of a metal identical to or or having similar electrochemical potential to the encapsulation layer;
etching the encapsulation layer about the metalized structures in the contact areas. - View Dependent Claims (10, 11)
-
Specification