Taiwan Semiconductor Manufacturing Comp. Ltd.

Ouyang Hui

Matt Yeh

Fan-Yi Hsu

Yi-Chen Huang

Peng-Soon Lim

Shun Wu Lin

An method of fabricating the gate structure comprises: sequentially depositing and patterning a dummy oxide layer and a dummy gate electrode layer on a substrate; surrounding the dummy oxide layer and the dummy gate electrode layer with a nitrogen-containing dielectric layer and an interlayer dielectric layer; removing the dummy gate electrode layer; removing the dummy oxide layer by exposing a surface of the dummy oxide layer to a vapor mixture comprising NH3 and a fluorine-containing compound at a first temperature; heating the substrate to a second temperature to form an opening in the nitrogen-containing dielectric layer; depositing a gate dielectric; and depositing a gate electrode.

Method for fabricating a gate structure

A method of forming a FinFET device is provided. In one embodiment, a fin is formed on a substrate. A gate structure is formed over the fin, the gate structure having a dielectric layer and a conformal first polysilicon layer formed above the dielectric layer. An etch stop layer is formed above the first polysilicon layer and thereafter a second polysilicon layer is formed above the etch stop layer. The second polysilicon layer and the etch stop layer are removed. A metal layer is formed above the first polysilicon layer. The first polysilicon layer is reacted with the metal layer to silicide the first polysilicon layer. Any un-reacted metal layer is thereafter removed and source and drain regions are formed on opposite sides of the fin.

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Chubei, Taiwan

Ouyang Hui