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. 23, 2015
Filed:
Mar. 22, 2012
Ryuji Ohba, Kawasaki, JP;
Ryuji Ohba, Kawasaki, JP;
KABUSHIKI KAISHA TOSHIBA, Tokyo, JP;
Abstract
According to one embodiment, a memory device includes the following structure. A first double tunnel junction structure includes a first nanocrystal layer that includes first conductive minute particles, and first and second tunnel insulating films arranged to sandwich the first nanocrystal layer. A second double tunnel junction structure includes a second nanocrystal layer that includes second conductive minute particles, and third and fourth tunnel insulating films arranged to sandwich the second nanocrystal layer. A charge storage layer is arranged between the first and second double tunnel junction structures. First and second conductive layers are arranged to sandwich the first double tunnel junction structure, the charge storage layer, and the second double tunnel junction structure. The first conductive minute particles has an average grain size which is different from that of the second conductive minute particles.