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. 04, 1998
Filed:
Apr. 25, 1995
Thomas C Taylor, Colorado Springs, CO (US);
Ramtron International Corporation, Colorado Springs, CO (US);
Abstract
A method of fabricating a metal-ferroelectric-metal ('MFM') capacitor includes the steps of depositing a silicon dioxide layer on a silicon or other substrate, a lower platinum or other noble metal electrode, a PZT or other ferroelectric material dielectric layer, and an upper platinum or other noble metal electrode. The upper electrode and ferroelectric dielectric layer are patterned and etched according to a first pattern corresponding to the final dimensions of the ferroelectric dielectric layer. The upper electrode and lower electrode are subsequently patterned and etched according to a second pattern corresponding to the final dimensions of one or more upper electrodes and the final extent of the lower electrode. The second etching step leaves a benign vestigial upper electrode feature. An oxide layer is finally deposited over the entire surface of the MFM capacitor structure, which is etched and metalized over desired upper and lower electrode contacts.