Patent ID: 11961854
Assignee: nan
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A semiconductor device, comprising:
a dielectric layer without convexities or concavities; and
a semiconductor substrate, comprising a first type semiconductor layer and a second type semiconductor layer, wherein the first type semiconductor layer is disposed between the dielectric layer and the second type semiconductor layer and has a top surface having a convexity or a concavity, the second type semiconductor layer is disposed on the top surface of the first type semiconductor layer, and a bottom surface of the second type semiconductor layer is protruded according to the convexity or recessed according to the concavity, and
wherein a thickness of the first type semiconductor layer gradually decreases outward from a center of the convexity or gradually increases outward from a center of the concavity.