Patent ID: 11881481
Assignee: INVENTION AND COLLABORATION LABORATORY PTE. LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 15:
16. A complementary MOSFET structure comprising:
a semiconductor wafer substrate with a semiconductor surface and a trench formed below the semiconductor surface;
a P type MOSFET comprising a first conductive region;
a N type MOSFET comprising a second conductive region; and
a localized isolation region between the P type MOSFET and the N type MOSFET;
wherein the localized isolation region includes a vertically extended isolation region and a horizontally extended isolation region, wherein the horizontally extended isolation region comprises an isolation layer disposed in the trench and a L-shaped oxide layer covering on both a sidewall and a bottom wall of the trench;
wherein the isolation layer has a top surface substantially aligned with a top surface of the L-shaped oxide layer;
wherein a latch-up path between the P type MOSFET and the N type MOSFET is at least dependent on a bottom length of the horizontally extended isolation region.