Patent ID: 11955524
Assignee: SHANGHAI HUALI INTEGRATED CIRCUIT CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The semi-floating gate device according to claim 1, wherein the floating gate structure further comprises a gate trench, a bottom surface of the gate trench enters the first well region, and the lightly doped source region is located on the first well region and contacts a first side surface of the gate trench; the lightly doped drain region is located on the first well region and contacts a second side surface of the gate trench;
the floating gate dielectric layer covers the bottom surface and side surfaces of the gate trench and extends to the surface of the lightly doped drain region outside the gate trench; and
the floating gate material layer completely fills the gate trench formed with the floating gate dielectric layer and extends to the floating gate dielectric layer and the dielectric layer window outside the gate trench.