Recent Progress in Potassium Sodium Niobate Lead-free Thin Films

Lead-free potassium sodium niobate (KNN)-based thin films have attracted much interest in replacing current lead zirconate titanate (PZT)-based piezoelectric thin films in micro electromechanical (MEMS) devices due to the increasing awareness and legislation concerning lead oxide toxicity. Recently,...

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Bibliographic Details
Published in:Journal of the Korean Physical Society 2018, 72(12), , pp.1467-1483
Main Authors: Seog, Hae Jin, Ullah, Aman, Ahn, Chang Won, Kim, Ill Won, Lee, Sun Young, Park, Jungmin, Lee, Hai Joon, Won, Sung Sik, Kim, Seung-Hyun
Format: Article
Language:English
Subjects:
Ferroelectric materials
Ferroelectricity
JKPS 50th Anniversary Reviews
Lead free
Lead oxides
Lead zirconate titanates
Leakage current
Legislation
Magnetron sputtering
Mathematical and Computational Physics
Microelectromechanical systems
Niobates
Organic chemistry
Particle and Nuclear Physics
Physics
Physics and Astronomy
Piezoelectricity
Potassium
Properties (attributes)
Review Articles
Sodium compounds
Sol-gel processes
Theoretical
Thin films
Toxicity
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Summary:Lead-free potassium sodium niobate (KNN)-based thin films have attracted much interest in replacing current lead zirconate titanate (PZT)-based piezoelectric thin films in micro electromechanical (MEMS) devices due to the increasing awareness and legislation concerning lead oxide toxicity. Recently, promising piezoelectric performance has been achieved in KNN-based thin films by compositional modification. Over the last decade, our group has concentrated on the fabrication of KNN-based thin films using sol-gel and RF sputtering techniques and has obtained encouraging results. However, controlling the complex stoichiometric compositions in KNN-based thin films is still challenging due to volatilization of alkaline elements and the high leakage current density. In the current review, the available synthetic approaches, chemical modification strategies, and stabilizing agents used to try and overcome these challenges and improve the piezoelectric properties of KNN-based thin films are reviewed. Herein, we systematically describe the recent advancements of the ferroelectric and piezoelectric properties of KNN-based thin films and summarize the properties of KNN-based thin films fabricated by various techniques, such as sol-gel and RF magnetron sputtering.
ISSN:0374-4884
1976-8524
DOI:10.3938/jkps.72.1467