Patent ID: 11945712
Assignee: STMICROELECTRONICS S.R.L.
Field: Micro-structural and nano-technology (Chemistry)
Classification: CPC B | IPC B

Claim 5:
6. A device, comprising:
a substrate;
a first semiconductor layer having a first thickness and on the substrate;
a plurality of first trenches extending through the first semiconductor layer to the substrate;
a second semiconductor layer on the first semiconductor layer, the second semiconductor layer directly contacting the first semiconductor layer;
a plurality of second trenches extending through the second semiconductor layer to the first semiconductor layer; and
a plurality of third trenches through the first and second semiconductor layers to the substrate;
a stopper structure including:
an abutment pillar of the first semiconductor layer, the abutment pillar being anchored relative to the substrate; and
a wall of the first semiconductor layer and of the second semiconductor layer, the wall including:
a portion extending from the substrate in a first direction; and
a projecting arm that extends from the portion in a second direction transverse to the portion, the projecting arm overlaps the abutment pillar and is spaced apart from the abutment pillar by a gap and at least one respective first trench of the plurality of first trenches.