Semiconductor device

A semiconductor device comprising a substrate having a main surface, and an end surface defining an outer edge of the substrate and extending in a direction transverse to the main surface, and the substrate being provided with a notch portion connected to the main surface and the end surface, the main surface including a peripheral region and a device region surrounded by the peripheral region, the notch portion extending in a form of a stripe along the direction in which the end surface extends,

• the notch portion including a side surface that is inward from the end surface and connected to the main surface and a bottom surface that extends inwardly from the end surface and is connected to the side surface and the end surface,
• the notch portion being constituted of only an exposed surface of the substrate.

A semiconductor device comprising:

• a substrate having a main surface, and an end surface defining an outer edge of the substrate and extending in a direction transverse to the main surface, and the substrate being provided with one or more first groove portions, the main surface including a peripheral region and a device region surrounded by the peripheral region, the one or more first groove portions being formed in the peripheral region, the one or more first groove portions extending along the end surface in a form of a stripe or stripes;
• and
• a first polycrystal film provided in the one or more first groove portions, the first polycrystal film extending in a form of a stripe along the direction in which the end surface extends.