Patent ID: 11972997
Assignee: ROHM CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. A semiconductor device comprising:
a conductive substrate having an obverse surface facing one side in a thickness direction and a reverse surface facing an opposite side from the obverse surface; and
at least one semiconductor element electrically bonded to the obverse surface, wherein the conductive substrate includes:
a first base layer and a second base layer each of which is made of graphite composed of stacked graphenes; and
a metal layer disposed between the first base layer and the second base layer,
the graphenes of the first base layer are stacked in a first stacking direction perpendicular to the thickness direction,
the graphenes of the second base layer are stacked in a second stacking direction perpendicular to the thickness direction and intersecting the first stacking direction,
the metal layer includes:
a first metal part formed on the first base layer, and
a second metal part formed on the second base layer and bonded to the first metal part, and
a void is present between the first metal part and the second metal part.