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

Claim 13:
14. A complementary MOSFET structure comprising:
a semiconductor wafer substrate with a semiconductor surface;
a P type MOSFET comprising a first conductive region;
a N type MOSFET comprising a second conductive region;
a cross-shape localized isolation region between the P type MOSFET and the N type MOSFET, wherein the cross-shape localized isolation region includes a horizontally extended isolation region below the semiconductor surface, and the horizontally extended isolation region contacts to a bottom side of the first conductive region and a bottom side of the second conductive region; the horizontally extended isolation region is a composite isolation region comprising an oxide layer and a Nitride layer over the oxide layer.