Patent ID: 11881505
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 12:
13. A semiconductor structure, comprising:
a plurality of fins on a semiconductor substrate, the plurality of fins comprising an alternating vertically-stacked sequence of a first nanosheet comprising a first semiconductor material and a second nanosheet comprising a second semiconductor material;
a first liner covering top surfaces of the semiconductor substrate exposed by a recess located between adjacent fins, the first liner comprising a first oxide material;
a second liner directly above the first liner, the second liner comprising a second oxide material;
a third liner directly above the second liner, the third liner comprising a nitride material, wherein together the first liner, the second liner and the third liner form a tri-layer shallow trench isolation (STI) liner; and
a dielectric material directly above the third liner, the dielectric material filling a remaining space within the recess to form an STI region within the semiconductor substrate between the adjacent fins, the second oxide material creates a dipole effect that neutralizes positive charges generated within the third liner and between the third liner and the first liner, wherein a thickness of the second oxide material forming the second liner is sufficient to cancel a charging effect of the nitride material forming the third liner.