Patent ID: 11876055
Assignee: LAPIS SEMICONDUCTOR CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 3:
4. A semiconductor wafer formed of silicon carbide, a plurality of semiconductor devices being formed at one surface of the semiconductor wafer, and the semiconductor wafer comprising:
a scribe line partitioning the semiconductor devices; and
a plurality of trenches formed in the scribe line, interiors of the trenches being filled with a material with a coefficient of thermal expansion different from a coefficient of thermal expansion of the silicon carbide,
wherein each of the semiconductor devices comprises:
a semiconductor substrate formed of silicon carbide with a 4H—SiC crystal structure, components being formed at one surface of the semiconductor substrate, and the semiconductor substrate being formed in a rectangular shape in plan view;
a periphery portion disposed at a pre-specified region of a periphery of the semiconductor substrate, the components not being formed at the periphery portion; and
the plurality of trenches or portions of the trenches formed at the periphery portion, each of the trenches being formed in a polygonal shape in plan view,
wherein a side of the semiconductor substrate in one direction is parallel with a direction of a crystal axis of the crystal structure, and at least one side in plan view of each of the trenches is orthogonal to the direction of the crystal axis.