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US 4,226,932 AGranted
Titanium nitride as one layer of a multi-layered coating intended to be etched
AssigneeGTE Automatic Electric Laboratories Incorporated
InventorGiampiero Ferraris
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Abstract
A multilayered thin film structure comprising layers of resistive and conductive materials on a substrate, said layers including tantalum nitride, palladium and gold. A layer of titanium nitride, is used between the tantalum nitride and palladium layers to act as an adhesive layer, to prevent undercutting during etching, and to allow all metal depositing to be performed during one step.
Claims8
A multilayered thin film structure for use in hybrid integrated circuits comprising:
- substrate means providing a base for said structure;
- resistive means located on said substrate means;
- an adhesive layer of titanium nitride located on said resistive means;
- thermal diffusion barrier means located on said titanium nitride means;
- conductive means located on said thermal diffusion barrier means;
- said thermal diffusion barrier means functioning to prevent the diffusion of titanium included in said titanium nitride, to said conductive means in response to heat.
3 more elements
A method of making a multilayered thin film structure for use in hybrid integrated circuits, said method comprising:
- a first step of placing a substrate in a vacuum station;
- a second step of depositing on said substrate a layer of tantalum nitride, by means of sequential sputtering deposition;
- a third step of depositing a layer of titanium on said layer of tantalum nitride and doping the titanium layer with nitrogen during sputtering to obtain a layer of titanium nitride;
- a fourth step of depositing on said titanium nitride layer, a layer of palladium;
- and
- a fifth step of depositing on said palladium layer, a layer of gold.
3 more elements
Dependencies are inferred from the claim text.