Patent ID: 11862692
Assignee: INFINEON TECHNOLOGIES AUSTRIA AG
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method of producing a transistor device, the method comprising:
forming a plurality of trenches in a semiconductor substrate and extending lengthwise in parallel with one another in a first direction parallel to a first surface of the semiconductor substrate such that each pair of adjacent trenches of the plurality of trenches confines a semiconductor mesa;
forming a field electrode and a gate electrode in each of the plurality of trenches;
forming a final metallization layer above the semiconductor substrate;
forming a plurality of field plate contacts that extend lengthwise in parallel with one another in the first direction and electrically connect the final metallization layer to the field electrodes; and
forming a plurality of mesa contacts that extend lengthwise in parallel with one another in the first direction and electrically connect the final metallization layer to the semiconductor mesas,
wherein forming the plurality of field plate contacts comprises dividing each field plate contact along the length of the plurality of trenches into a plurality of field plate contact segments that are separated from one another,
wherein forming the plurality of mesa contacts comprises dividing each mesa contact along the length of the plurality of trenches into a plurality of mesa contact segments that are separated from one another,
wherein in a first area adjacent to an end of the plurality of trenches, a first line that runs perpendicular to the plurality of trenches intersects a first field plate contact segment of the plurality of field plate contacts and a first mesa contact segment of the plurality of mesa contacts,
wherein in a second area spaced inward from the first area, a second line that runs perpendicular to the plurality of trenches intersects a second field plate contact segment of the plurality of field plate contacts and a second mesa contact segment of the plurality of mesa contacts.