Patent ID: 11961910
Assignee: APPLIED MATERIALS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 10:
11. A method of fabricating a ferroelectric capacitive device, the method comprising:
depositing a plurality of metal layers comprising:
a first metal layer comprising a first metal having a first work function; and
a second metal layer comprising a second metal having a second work function that is different from the first work function, wherein the first metal layer is approximately parallel to the second metal layer;

etching a vertical hole in the plurality of metal layers; and
filling the vertical hole with:
a vertical electrode that is approximately perpendicular to the first metal layer and approximately perpendicular to the second metal layer; and
a ferroelectric material that surrounds the vertical electrode and directly contacts the vertical electrode and directly contacts the plurality of metal layers to form the ferroelectric capacitive device with a plurality of switching regions in the ferroelectric material comprising:
a first switching region between the vertical electrode and the first metal layer that switches in response to a voltage between the vertical electrode and a vertical contact that contacts the first metal layer; and
a second switching region between the vertical electrode and the second metal layer that switches in response to the voltage between the vertical electrode and the vertical contact that contacts the first metal layer.