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:
May. 12, 2020
Filed:
Sep. 01, 2017
Toshiba Memory Corporation, Minato-ku, Tokyo, JP;
Akio Kaneko, Yokkaichi Mie, JP;
TOSHIBA MEMORY CORPORATION, Tokyo, JP;
Abstract
A semiconductor device includes a first electrode layer and a second electrode layer formed thereon to be spaced from the first electrode layer, a columnar portion penetrating the first and second electrode layers in a first direction and including a semiconductor layer, a first insulating film between the first and second electrode layers and the semiconductor layer and in contact with the first electrode layer, a charge storage layer between the second electrode layer and the first insulating film, and an insulating film between the second electrode layer and the charge storage layer. The semiconductor layer includes a first portion facing the second electrode layer in a second direction intersecting with the first direction and a second portion in contact with the first portion in the first direction. A concentration of a impurity contained in the second portion is higher than that of the impurity contained in the first portion.