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Sputtered Pb(Zr, Ti)O3 Thin Films for Ferroelectric Capacitors

Published online by Cambridge University Press:  10 February 2011

T. Sakoda ,
K. Aoki  and
Y. Fukuda
T. Sakoda
Affiliation:
Texas Instruments Tsukuba R&D Center Ltd., 17 Miyukigaoka, Tsukuba, Ibaraki 305–0841, JAPAN
K. Aoki
Affiliation:
Texas Instruments Tsukuba R&D Center Ltd., 17 Miyukigaoka, Tsukuba, Ibaraki 305–0841, JAPAN
Y. Fukuda
Affiliation:
Texas Instruments Tsukuba R&D Center Ltd., 17 Miyukigaoka, Tsukuba, Ibaraki 305–0841, JAPAN
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Abstract

Sputtered Pb(Zr, Ti)O3 thin films with superior ferroelectric properties were successfully obtained by controlling the grain structure and the film compositions. We found that amorphous PbTiO3 buffer layers are effective in forming PZT thin films with fine dense grains. The sputtered PZT thin films with Ti-rich phase showed excellent ferroelectric properties. The polarization retention properties of PZT capacitors with Ti-rich phase are remarkable, and the value of the retained polarization density after 10 years is expected to be larger than 40 μC/cm2. Further, 150-nm-thick PZT capacitors with Zr/Ti=30/70 showed 2P, at 1.5 V of more than 30 μC/cm2, and good retention property. These results indicate the potential of the lower voltage operation of sputtered PZT capacitors by optimizing the film composition and thickness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 596: Symposium Y – Ferroelectric Thin Films VIII , 1999 , 277
Copyright
Copyright © Materials Research Society 2000

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