Semiconductor device comprising a transistor cell including a source contact in a trench, method for manufacturing the semiconductor device and integrated circuit

US9859418B2 · kind B2 · utility

Assignee

• Infineon Technologies Dresden GmbH & Co. KG · DE

Inventors

• Andreas Meiser · Unterhaching, DE
• Karl-Heinz Gebhardt · Dresden, DE
• Till Schloesser · Dresden, DE
• Detlef Weber · Grünberg, DE

Key dates

• Filing date: Aug 11, 2016
• Grant date: Jan 2, 2018
• Expiry date: Aug 11, 2036

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L21/26586
• WIPO field: Semiconductors
• WIPO sector: Electrical engineering

Abstract

A semiconductor device is provided including a transistor cell in a semiconductor substrate having a first main surface. The transistor cell includes a gate electrode in a gate trench in the first main surface adjacent to a body region. A longitudinal axis of the gate trench extends in a first direction parallel to the first main surface. A source region, a body region and a drain region are disposed along the first direction. A source contact comprises a first source contact portion and a second source contact portion. The second source contact portion is disposed at a second main surface of the semiconductor substrate. The first source contact portion includes a source conductive material in direct contact with the source region and a portion of the semiconductor substrate arranged between the source conductive material and the second source contact portion.