Photo-induced polarization recovery in PZT thin film capacitors

Said Mansour, A. V. Rao, A. L. Bement, G. Liedl

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Lead Zirconate Titanate (PZT) ferroelectric thin film capacitors were fabricated with metallic platinum and conducting Indium Tin Oxide (ITO) contacts. PZT thin films were fabricated using metallorganic decomposition (MOD) while a combination of MOD and RF-sputtering was used in fabricating the ITO-PZT-ITO capacitors. Photo-induced changes, manifested by an increase in switchable polarization, were studied before and after 10 8 switching cycles fatigue using white and monochromatic light. An increase in photo-induced changes was observed at 3.65 eV light energies using monochromatic light using both capacitors. The increase was attributed to the excitation of electrons from PZT valence band into the conduction band causing an increase in film conductivity. However, polarization increase in Pt-PZT-Pt capacitor was more pronounced than ITO-PZT-ITO when white light was used. Some of the response in fatigued Pt-PZT-Pt capacitors was attributed to the excitation of electrons from the platinum Fermi level to oxygen vacancy sites trapped at the Pt-PZT interface by absorption of infrared radiation of white light. The latter observation implied a relationship between PZT fatigue and photo-induced effects.

Original languageEnglish
Title of host publicationMaterials Research Society Symposium - Proceedings
EditorsE.P. George, R. Gotthardt, K. Otsuka, S. Trolier-McKinstry, M. Wun-Fogle
PublisherMaterials Research Society
Pages201-205
Number of pages5
Volume459
Publication statusPublished - 1997
Externally publishedYes
EventProceedings of the 1996 MRS Fall Symposium - Boston, MA, USA
Duration: 2 Dec 19965 Dec 1996

Other

OtherProceedings of the 1996 MRS Fall Symposium
CityBoston, MA, USA
Period2/12/965/12/96

Fingerprint

Tin oxides
Indium
Polarization
Recovery
Capacitors
Platinum
Fatigue of materials
Decomposition
Ferroelectric thin films
Electrons
Oxygen vacancies
Valence bands
Fermi level
Conduction bands
Sputtering
Lead
Film capacitor
indium tin oxide
Infrared radiation
Thin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Mansour, S., Rao, A. V., Bement, A. L., & Liedl, G. (1997). Photo-induced polarization recovery in PZT thin film capacitors. In E. P. George, R. Gotthardt, K. Otsuka, S. Trolier-McKinstry, & M. Wun-Fogle (Eds.), Materials Research Society Symposium - Proceedings (Vol. 459, pp. 201-205). Materials Research Society.

Photo-induced polarization recovery in PZT thin film capacitors. / Mansour, Said; Rao, A. V.; Bement, A. L.; Liedl, G.

Materials Research Society Symposium - Proceedings. ed. / E.P. George; R. Gotthardt; K. Otsuka; S. Trolier-McKinstry; M. Wun-Fogle. Vol. 459 Materials Research Society, 1997. p. 201-205.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mansour, S, Rao, AV, Bement, AL & Liedl, G 1997, Photo-induced polarization recovery in PZT thin film capacitors. in EP George, R Gotthardt, K Otsuka, S Trolier-McKinstry & M Wun-Fogle (eds), Materials Research Society Symposium - Proceedings. vol. 459, Materials Research Society, pp. 201-205, Proceedings of the 1996 MRS Fall Symposium, Boston, MA, USA, 2/12/96.
Mansour S, Rao AV, Bement AL, Liedl G. Photo-induced polarization recovery in PZT thin film capacitors. In George EP, Gotthardt R, Otsuka K, Trolier-McKinstry S, Wun-Fogle M, editors, Materials Research Society Symposium - Proceedings. Vol. 459. Materials Research Society. 1997. p. 201-205
Mansour, Said ; Rao, A. V. ; Bement, A. L. ; Liedl, G. / Photo-induced polarization recovery in PZT thin film capacitors. Materials Research Society Symposium - Proceedings. editor / E.P. George ; R. Gotthardt ; K. Otsuka ; S. Trolier-McKinstry ; M. Wun-Fogle. Vol. 459 Materials Research Society, 1997. pp. 201-205
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AB - Lead Zirconate Titanate (PZT) ferroelectric thin film capacitors were fabricated with metallic platinum and conducting Indium Tin Oxide (ITO) contacts. PZT thin films were fabricated using metallorganic decomposition (MOD) while a combination of MOD and RF-sputtering was used in fabricating the ITO-PZT-ITO capacitors. Photo-induced changes, manifested by an increase in switchable polarization, were studied before and after 10 8 switching cycles fatigue using white and monochromatic light. An increase in photo-induced changes was observed at 3.65 eV light energies using monochromatic light using both capacitors. The increase was attributed to the excitation of electrons from PZT valence band into the conduction band causing an increase in film conductivity. However, polarization increase in Pt-PZT-Pt capacitor was more pronounced than ITO-PZT-ITO when white light was used. Some of the response in fatigued Pt-PZT-Pt capacitors was attributed to the excitation of electrons from the platinum Fermi level to oxygen vacancy sites trapped at the Pt-PZT interface by absorption of infrared radiation of white light. The latter observation implied a relationship between PZT fatigue and photo-induced effects.

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