Taiwan Semiconductor Manufacturing Comp. Ltd.

Yen-Yi Lin

Chie-Ming Yang

Jih-Hwa Wang

A method for fabricating polycide gate electrodes wherein voids at the silicide/polysilicon interface are eliminated by thermal annealing is described. A layer of gate silicon oxide is grown over the surface of a semiconductor substrate. A polysilicon layer is deposited overlying the gate silicon oxide layer. A silicide layer is formed overlying the polysilicon layer. The semiconductor substrate is annealed by rapid thermal annealing (RTA). Thereafter, an oxide layer is deposited overlying the silicide layer. Because the silicide layer has been annealed, silicon atoms are prevented from diffusing into the silicide layer and forming voids in the polysilicon layer. The silicide, polysilicon and gate silicon oxide layers are patterned to complete fabrication of a gate electrode in the manufacture of an integrated circuit device.

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Hsin-Chu, Taiwan

Yen-Yi Lin