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Self-polarization Mechanism in Textured Pyroelectric Pb(Ti1-xZrx)O3 films

Published online by Cambridge University Press:  21 March 2011

G. Suchaneck ,
G. Gerlach ,
Yu. Poplavko ,
A. I. Kosarev  and
A. N. Andronov
G. Suchaneck
Affiliation:
Dresden University of Technology, Institute for Solid State Electronics, Mommsenstr. 13, 01062 Dresden, Germany
G. Gerlach
Affiliation:
Dresden University of Technology, Institute for Solid State Electronics, Mommsenstr. 13, 01062 Dresden, Germany
Yu. Poplavko
Affiliation:
National Technical University of Ukraine, Peremogi Av. 37, 252056 Kyiv, Ukraine
A. I. Kosarev
Affiliation:
A. F. Joffe Physico-Technical Institute, ul. Polytekhnicheskaya 26, 194021 St. Petersburg, Russia
A. N. Andronov
Affiliation:
St. Petersburg State Technical University, ul. Polytechnicheskaya 29, 194251 St. Petersburg, Russia
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Abstract

Self-polarization of Pb(Ti1−xZrx)O3 (PZT) thin films is explained on the basis of the formation of a TiO2−x-enriched interlayer close to the bottom electrode. Electrons provided by oxygen vacancies generate a n-type interface layer in the PZT at the electrode. A graded ferroelectric layer is then formed by electron injection from the bottom electrode and electron trapping on Ti4+ ions. A “built-in” difference in free energy forms which acts to pole the ferroelectric. Band bending was observed by contact potential difference measurements at a distance of 70 to 90 nm from the bottom electrode.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 655 , 2000 , CC7.7.1
Copyright
Copyright © Materials Research Society 2001

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