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:
Aug. 07, 2012
Filed:
Jul. 23, 2007
Kiwamu Adachi, Kanagawa, JP;
Satoshi Horiuchi, Kanagawa, JP;
Kiwamu Adachi, Kanagawa, JP;
Satoshi Horiuchi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A capacitor includes a first electrode, a dielectric layer, and a second electrode that are sequentially stacked. The dielectric layer has a stacked layer structure including a predetermined number of hafnium oxide sublayers and predetermined number of tantalum oxide sublayers. The number, materials, and thicknesses of the sublayers are determined so that the thickness ratio has a range in which, in voltage-leakage current characteristics showing the relationship between the voltage between the first and second electrodes and the leakage current, a start voltage at which the slope of an increase in the current starts to discontinuously increase satisfies an electric field strength of 3 [MV/cm] or more when the ratio of the total thickness of the predetermined number of tantalum oxide sublayers to the total thickness of the dielectric layer is varied, and the thickness ratio is within the range such that the start voltage is within the range.