The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 24, 2025
Filed:
Sep. 06, 2022
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Electronic Devices & Storage Corporation, Tokyo, JP;
Tatsuya Shiraishi, Nonoichi Ishikawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Toshiba Electronic Devices & Storage Corporation, Tokyo, JP;
Abstract
A semiconductor device of an embodiment includes a first electrode, a first semiconductor layer of first conductivity type provided on the first electrode; a second semiconductor layer of first conductivity type provided on the first semiconductor layer; a first semiconductor region of second conductivity type provided on the second semiconductor layer; a first insulating film provided in a trench reaching the second semiconductor layer from above the first semiconductor region, a dielectric constant of an upper part of the first insulating film being higher than a dielectric constant of a lower part of the first insulating film; a second electrode provided in the trench, the second electrode facing the first semiconductor region; and a second insulating film provided between the second electrode and the first semiconductor region, the second insulating film being provided on the first insulating film in the trench.