Patent ID: 10431501

Abstract:
Semiconductor devices and fabrication methods thereof are provided. An exemplary fabrication method includes forming an interlayer dielectric layer on a base substrate; forming a plurality of first openings and second openings in the interlayer dielectric layer, one first opening connecting to a second opening, the one first opening being between the second opening and the base substrate; forming a high-K gate dielectric layer on side and bottom surfaces of the first openings and on side surfaces of the second openings; forming a cap layer, containing oxygen ions, on the high-K gate dielectric layer; forming an amorphous silicon layer on the cap layer at least on the bottoms of the first openings; performing a thermal annealing process on the amorphous silicon layer, the cap layer and the high-K dielectric; removing the amorphous silicon layer; and forming a metal layer, in the first openings and the second openings.