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Scaled PLZT Thin Film Capacitors with Excellent Endurance and Retention Performance

Published online by Cambridge University Press:  21 March 2011

Fan Chu ,
Glen Fox  and
Tom Davenport
Fan Chu
Affiliation:
Ramtron International Corporation, 1850 Ramtron Drive, Colorado Springs, CO 80921, U.S.A e-mail: fchu@ramtron.com
Glen Fox
Affiliation:
Ramtron International Corporation, 1850 Ramtron Drive, Colorado Springs, CO 80921, U.S.A
Tom Davenport
Affiliation:
Ramtron International Corporation, 1850 Ramtron Drive, Colorado Springs, CO 80921, U.S.A
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Abstract

The requirements for future ferroelectric non-volatile memories (FRAM) include lower operating voltages, higher densities and tighter design rules. In order to achieve these requirements the key component of the FRAM device, viz., the PbZrxTi1划xO3 (PZT) thin film capacitor must be scaled dimensionally to obtain reduced film thickness and capacitor area. This paper presents the ferroelectric performance of RF magnetron sputtered PLZT thin films with thickness scaled down to 1000Å. The switching performance of the thickness scaled PLZT thin films meets the requirements of 1.8V FRAM device. Though PLZT ceramic thin films, of which the fatigue is often a concern, are utilized as non-volatile component, excellent fatigue performance was observed. The scaled PLZT thin film capacitors are fatigue free up to 1011 fatigue cycles (E=200kV/cm). The scaled 1000Å PLZT thin films also showed good imprint performance. The opposite-state charge after 10 years baking at 150°C was still above the sensing level. The thickness scaled PZT thin films, showing dramatically improved ferroelectric performance, can be applied to the manufacturing of low voltage FRAM products.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 655 , 2000 , CC1.2.1
Copyright
Copyright © Materials Research Society 2001

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