Back to results
US 9,850,588 B2Granted
Bismuth electroplating baths and methods of electroplating bismuth on a substrate
AssigneeRohm and Haas Electronic Materials LLC
InventorsAdolphe Foyet, Margit Clauss
Life of this patent
Estimating the term…
Abstract
Acid bismuth electroplating baths are stable and have high current efficiency over the life of the baths. The bismuth baths are easy to control because of the reduced number of bath components.
Claims10
A bismuth electroplating bath consisting of one or more sources of bismuth ions;
- one or more acids;
- and one or more polyoxyethylene aryl ethers;
- water;
- and, optionally, one or more amine oxides, one or more antifoam agents, and one or more antimicrobials;
- the bismuth electroplating bath is free of alloying metals.
2 more elements
A method of electroplating bismuth metal comprising:
- a) providing a substrate;
- b) providing a bismuth electroplating bath consisting of one or more sources of bismuth ions;
- one or more acids;
- and one or more polyoxyethylene aryl ethers;
- water;
- and, optionally, one or more amine oxides, one or more antifoam agents, and one or more antimicrobials;
- the bismuth electroplating bath is free of alloying metals;
- c) contacting the substrate with the bismuth electroplating bath;
- d) applying a current to the bismuth electroplating bath and substrate;
- and
- e) electroplating matte bismuth on the substrate.
8 more elements
Dependencies are inferred from the claim text.