Patent ID: 11874540
Assignee: UNIVERSITY OF SOUTHAMPTON
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 27:
28. The method of claim 26, further comprising, after depositing or growing an insulating material onto the outer wall to form the ring-shaped insulating region:
etching a hole in the insulating layer, the hole extending to the inner disk;
depositing the polycrystalline semiconductor material to fill the hole and partially fill the outer trench;
etching away the polycrystalline semiconductor material in the hole, and
a planarising step that removes the polycrystalline semiconductor material down to the level of the insulating layer to form a capacitor comprising the ring-shaped insulating region sandwiched between an outer conductive region and an inner conductive region, wherein the outer conductive region is formed of the polycrystalline semiconductor material and the inner conductive region is formed of the crystalline material.