The influence of Mn doping on the leakage current mechanisms and resistance degradation behavior in lead zirconate titanate films

The electrical reliability of lead zirconate titanate (PZT) films was improved by incorporating Mn; the time dependent dielectric breakdown lifetimes and the associated activation energy both remarkably increased with Mn concentration. The correlation between the defect chemistry and the resistance degradation was studied to understand the physical mechanism(s) responsible for enhanced electrical reliability. At lower electric fields, Poole-Frenkel emission was responsible for the leakage current. Beyond a threshold electric field, Schottky emission controlled the leakage. After electrical degradation of a 2 mol.% Mn doped PZT film, no significant change in potential barrier height for injecting electrons from the cathode into the anode was observed. This suggests that the degradation is mostly controlled by Poole-Frenkel conduction via some combination of hole migration between lead vacancies, small polaron hopping between Mn sites, and hole hopping between Pb2+ and Pb3+. No variation in the valence state of Ti near the cathode was observed in degraded Mn doped PZT films, implying that multivalent Mn provides trap sites for electrons and holes; free electron generation due to compensation of oxygen vacancies at the cathode and free hole formation at the anode region might be suppressed by the valence changes from Mn3+ to Mn2+ and Mn2+ to Mn3+ respectively.

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Work Title The influence of Mn doping on the leakage current mechanisms and resistance degradation behavior in lead zirconate titanate films
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Open Access
Creators
  1. Betul Akkopru-Akgun
  2. Thorsten J.M. Bayer
  3. Kosuke Tsuji
  4. Clive A. Randall
  5. Michael T. Lanagan
  6. Susan Trolier-McKinstry
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Acta Materialia
Publication Date April 15, 2021
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.actamat.2021.116680
Deposited December 08, 2021

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  • Added The_Influence_of_Mn_Doping_on_the_Leakage_Current_Mechanisms_and_Resistance_Degradation_Behavior_in_Lead_Zirconate_Titanate_Films-ActaMat-2021.pdf
  • Added Creator Betul Akkopru-Akgun
  • Added Creator Thorsten J.M. Bayer
  • Added Creator Kosuke Tsuji
  • Added Creator Clive A. Randall
  • Added Creator Michael T. Lanagan
  • Added Creator Susan Trolier-McKinstry
  • Published
  • Updated
  • Updated