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Electrical Properties of PZT Thin Film Capacitors with Novel Pt-Ir Based Electrode Barriers for Nonvolatile Memories

Published online by Cambridge University Press:  10 February 2011

Chandra S. Desu ,
Ramakrishna Vedula ,
Kwang B. Lee  and
Seshu B. Desu
Chandra S. Desu
Affiliation:
Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061-0237
Ramakrishna Vedula
Affiliation:
Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061-0237
Kwang B. Lee
Affiliation:
Department of Physics, Sangji University, Wonju, Kangwondo 220-702, Korea
Seshu B. Desu
Affiliation:
Department of Materials Science and Engineering, Virginia Tech, Blacksburg, VA 24061-0237
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Abstract

A new electrode barrier structure based on noble metals Pt and Ir alloys and their oxides was proposed for the integration of PZT capacitors into high density nonvolatile memories. The proposed PtIrOx/PtIr/PtIrOx structure with Pt rich compositions (∼90%) is an excellent conducting electrode for the ferroelectric capacitor and a very good diffusion barrier for species like oxygen and Si. These structures are thermally stable up to the PZT processing temperatures of 650°C. PZT deposited on these electrodes crystallized predominantly in pervoskite phase. The test capacitors showed well saturated hysteresis loops with Pr and Ec of 21.3 µC/cm2 and 43 kV/cm, respectively. An extremely low polarization fatigue of 3% after 1× 1011 repetitions and leakage currents close to those on Pt were observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 541: Symposium O – Ferroelectric Thin Films VII , 1998 , 71
Copyright
Copyright © Materials Research Society 1999

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References

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