Patent ID: 11889679
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 10:
11. A semiconductor device, comprising:
a substrate having a plurality of trenches, the plurality of trenches including first trenches and second trenches having widths different from each other;
active patterns defined by the plurality of trenches;
an oxide layer covering an inner surface of each of the first trenches and the second trenches; and
a nitride layer filling the second trenches,
wherein at least one of opposite topmost ends of the active patterns has a stepwise portion, wherein
the stepwise portion comprises of a bottom surface and a side surface, and the bottom surface is parallel to a top surface of the active pattern,
the oxide layer is interposed between inner side surfaces of the second trenches and a side surface of the nitride layer,
the oxide layer is interposed between bottom surfaces of the second trenches and a bottom surface of the nitride layer,
the oxide layer and the nitride layer conform an insulating pattern,
the insulating pattern fully covers bottom surfaces, top surfaces, and inner side surfaces of the plurality of trenches such that is in continuous contact with the bottom surfaces, top surfaces, and inner side surfaces of the plurality of trenches and the bottom surface and side surface of the stepwise portion, and
the insulating pattern covers has a planar top surface that covers a top surface of the active patterns and a top surface of the plurality of trenches.