FINFET WITH DUAL SILICON GATE LAYER FOR CHEMICAL MECHANICAL POLISHING PLANARIZATION

摘要

A FinFET-type semiconductor device includes a fin structure (210) on which a relatively thin amorphous silicon layer (420) and then an undoped polysilicon layer (425) is formed. The semiconductor device may be planarized using a chemical mechanical polishing (CMP) in which the amorphous silicon layer (420) act as a stop layer to prevent damage to the fin structure.