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:
Sep. 13, 2016
Filed:
Sep. 09, 2015
Kabushiki Kaisha Toshiba, Minato-ku, JP;
KABUSHIKI KAISHA TOSHIBA, Minato-ku, JP;
Abstract
According to an embodiment, a semiconductor memory device comprises: a memory string comprising memory cells; and a contact electrically connected to one end of the memory string. The memory string comprises: control gate electrodes stacked above a first semiconductor layer; a second semiconductor layer having one end connected to the first semiconductor layer and having as its longitudinal direction a direction perpendicular to the first semiconductor layer, the second semiconductor layer facing the control gate electrodes; and a charge accumulation layer positioned between the control gate electrode and the second semiconductor layer. The contact has a plate-like shape whose longitudinal direction is a first direction, the contact has its lower surface connected to the first semiconductor layer, and the contact has a height of at least part of its upper surface lower than a height of an upper surface of the second semiconductor layer.