Treatment of silicon prior to nickel silicide formation

Details Treatment of silicon prior to nickel silicide formation Treatment of silicon prior to nickel silicide formation

2006-11-07

2006-11-07

Dang, Phuc T. (Department: 2818)

Semiconductor device manufacturing: process

Coating with electrically or thermally conductive material

To form ohmic contact to semiconductive material

C438S630000, C438S664000

Reexamination Certificate

active

07132365

ABSTRACT:
A method of preparing a die comprises treating exposed silicon to form an oxide prior to silicide formation; and depositing metal on the oxide. The metal may comprise titanium, cobalt, nickel, platinum, palladium, tungsten, molybdenum, or combinations thereof on the oxide. The oxide may be less than or equal to about 15 angstroms thick. In various embodiments, treating exposed silicon to form an oxide comprises forming a non-thermal oxide. Treating exposed silicon to form an oxide may also comprise treating the exposed silicon with an oxidizing plasma; alternatively, treating exposed silicon to form an oxide may comprise forming a chemical oxide. In certain other embodiments, treating exposed silicon to form an oxide comprises treating exposed silicon with a solution comprising ammonium hydroxide, hydrogen peroxide, and water; hydrochloric acid, hydrogen peroxide, and water; hydrogen peroxide; ozone; ozonated deionized water; or combinations thereof.

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