Method for gettering noble metals from mineral acid solution

Details Method for gettering noble metals from mineral acid solution Method for gettering noble metals from mineral acid solution

1992-11-13

1996-03-26

Mai, Ngoclan

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

210681, 210682, 134 13, 423 2, 423 22, 423 23, 423 87, 423 99, H01L 2100

Patent

active

055017673

ABSTRACT:
Silicon is employed as a reducing agent in an acid bath to adsorb noble metals present as contaminants in the acid. In the manufacture of silicon devices for electronic memory and other devices, polonium-210 is adsorbed by silicon getters to reduce soft error rate attributable to alpha particle emissions from the radioactive polonium. The noble metals in addition to polonium which can be plated onto silicon using the disclosed method are gold, silver, platinum, copper, palladium, mercury, selenium and bismuth.

REFERENCES:
patent: 3766036 (1973-10-01), McKaveney
patent: 4804526 (1989-02-01), Hall et al.
patent: 4952386 (1990-08-01), Davison et al.
patent: 5120443 (1992-06-01), Bruening et al.
patent: 5164093 (1992-11-01), Chilton et al.
patent: 5277715 (1994-01-01), Cathey

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