US Patent 10273142 Semiconductor MEMS structure

The present disclosure provides a structure. The structure comprises a cavity enclosed by a first substrate and a second substrate opposite to the first substrate. The structure also includes a movable membrane in the cavity. Further, the structure includes a mesa in the cavity and the mesa is protruded from a surface of the first substrate. In addition, the structure includes a dielectric layer over the mesa, wherein the dielectric layer includes a first surface in contact with the mesa and a second surface opposite to the first surface is positioned toward the cavity.