Growth and piezoelectric properties of amorphous and crystalline (K1−xNax)NbO3−based thin films

Jong Un Woo, Sun Woo Kim, Dae Su Kim, In Su Kim, Ho Sung Shin, Sahn Nahm

Research output: Contribution to journalReview articlepeer-review

3 Citations (Scopus)


(K1−xNax)NbO3 (KNN)-based piezoelectric thin films have been extensively studied for application in micro-electromechanical systems. However, growing homogenous crystalline (K1−xNax)NbO3 (CKNN) films with good piezoelectric properties is difficult because Na2O and K2O evaporate during the growth process at high temperatures. Recently, amorphous (K1−xNax)NbO3 (AKNN) films containing KNN nanocrystals with good piezoelectric properties have been fabricated at low temperatures. Furthermore, [001]-oriented crystalline (K1−xNax)NbO3 (OCKNN) films with excellent piezoelectric properties have been grown at low temperatures (≤ 350 °C) using a metal-oxide nanosheet seed layer. This novel method is excellent for the growth of homogeneous KNN thin films. These films were deposited on a polymer substrate; thus, they can be utilized in future flexible electronic devices. In this study, the structural and piezoelectric properties of AKNN- and CKNN-based films fabricated at high temperatures, along with the growth process and application of OCKNN-based thin films at low temperatures, are reviewed.

Original languageEnglish
Pages (from-to)249-268
Number of pages20
JournalJournal of the Korean Ceramic Society
Issue number3
Publication statusPublished - 2021 May

Bibliographical note

Funding Information:
This study was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (2020R1A2B5B01002063, 2020M3D1A2101018). We thank the KU-KIST Graduate School Program of Korea University.

Publisher Copyright:
© 2021, The Korean Ceramic Society.


  • Ferroelectrics
  • KNaNbO
  • Lead-free materials
  • Piezoelectrics
  • Thin films

ASJC Scopus subject areas

  • Ceramics and Composites


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