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:
Jul. 13, 2010
Filed:
Feb. 23, 2007
Tsutomu Hayakawa, Tokyo, JP;
Tsutomu Hayakawa, Tokyo, JP;
Elpida Memory, Inc., Tokyo, JP;
Abstract
A phase-change memory device has a different-material contact plug having a first electrically conductive material plug made of a first electrically conductive material, and a second electrically conductive material plug made of a second electrically conductive material having a specific resistance smaller than the first electrically conductive material, the first electrically conductive material plug and the second electrically conductive material plug being buried in a common contact hole. The different-material contact plug is effective for reducing the radiation of heat from a contact plug beneath a phase-change layer. The phase-change memory device also includes an extension electrode layer held in contact with a portion of the bottom surface of the phase-change layer in an area displaced off a position directly above a contact surface through which the phase-change layer and the heater electrode contact each other. The extension electrode layer reduces the radiation of heat from an electrode above the phase-change layer.