Fatigue and leakage current characteristics of lead free bilayer thin film structures

Mahesh, M.L.V. and Pal, Prem and Prasad, V.V. Bhanu and et al, . (2022) Fatigue and leakage current characteristics of lead free bilayer thin film structures. Ceramics International, 48 (7). pp. 9006-9013. ISSN 0272-8842

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Abstract

Multilayer thin films of (Ba0.50Sr0.50)TiO3 (BST) and Ba(Zr0.15Ti0.85)O3 (BZT) were deposited on Pt(111)/SiO2/Si(111) substrates using Pulsed LASER Deposition (PLD) technique. This manuscript reports on the role of a paraelectric layer in the stack of multilayers on certain key aspects related to crystallographic orientation, interface morphology, tunability, and energy storage properties. The incorporation of paraelectric layer is found to strongly influence the electrical properties of a ferroelectric layer whose composition is at the morphotropic phase boundary. A possible methodology to obtain enhanced electrical properties in multilayer structures based on electric field distribution across different layers in the stack is demonstrated. Incorporation of a paraelectric layer results in restricting the migration of oxygen vacancies due to the presence of the internal bias field. Retention of remanent polarization when driven by 109 bipolar switching cycles and other fatigue properties are reported. Leakage current characteristics were evaluated and the fitting of the experimental data with various conduction mechanisms indicate that different mechanisms are responsible for leakage current conduction as a function of bias voltage. A relatively high power density of >12 MW/cm3 with an energy storage density efficiency of >70%, tunability values comparable with multilayer thin films grown on single crystal substrates are some of the attributes of the multilayer structure. © 2021

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IITH Creators:
IITH CreatorsORCiD
Pal, Premhttps://orcid.org/0000-0001-7345-9769
Item Type: Article
Additional Information: The authors acknowledge the financial support from the Defence Research and Development Organization , Ministry of Defence , New Delhi for carrying out the present work. The authors acknowledge the AMCC group of Defence Metallurgical Research Laboratory (DMRL) for SEM data. Also, the authors would like to thank the Director, DMRL for permitting this research.
Uncontrolled Keywords: Fatigue characteristics; Leakage current mechanisms; Multilayers; Thin films; Tunability
Subjects: Others > Metallurgy Metallurgical Engineering
Physics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 22 Jul 2022 09:13
Last Modified: 22 Jul 2022 09:13
URI: http://raiith.iith.ac.in/id/eprint/9529
Publisher URL: http://doi.org/10.1016/j.ceramint.2021.12.082
OA policy: https://v2.sherpa.ac.uk/id/publication/13167
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