Ultrahigh Energy Storage Density in Glassy Ferroelectric Thin Films under Low Electric Field

Yunlong Sun, Le Zhang, Qianwei Huang, Zibin Chen (Corresponding Author), Dong Wang, Mohammad Moein Seyfouri, Shery L.Y. Chang, Yu Wang, Qi Zhang, Xiaozhou Liao, Sean Li, Shujun Zhang, Danyang Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


The current approach to achieving superior energy storage density in dielectrics is to increase their breakdown strength, which often incurs heat generation and unexpected insulation failures, greatly deteriorating the stability and lifetime of devices. Here, a strategy is proposed for enhancing recoverable energy storage density (Wr) while maintaining a high energy storage efficiency (η) in glassy ferroelectrics by creating super tetragonal (super-T) nanostructures around morphotropic phase boundary (MPB) rather than exploiting the intensely strong electric fields. Accordingly, a giant Wr of ≈86 J cm−3 concomitant with a high η of ≈81% is acquired under a moderate electric field (1.7 MV cm−1) in thin films having MPB composition, namely, 0.94(Bi, Na)TiO3-0.06BaTiO3 (BNBT), where the local super-T polar clusters (tetragonality ≈1.25) are stabilized by interphase strain. To the knowledge of the authors, the Wr of the engineered BNBT thin films represents a new record among all the oxide perovskites under a similar strength of electric field to date. The phase field simulation results ascertain that the improved Wr is attributed to the local strain heterogeneity and the large spontaneous polarization primarily is originated from the super-T polar clusters. The findings in this work present a genuine opportunity to develop ultrahigh-energy-density thin-film capacitors for low-electric-field-driven nano/microelectronics.

Original languageEnglish
Article number2203926
Number of pages10
JournalAdvanced Science
Issue number31
Publication statusPublished - 3 Nov 2022


  • energy storage
  • glassy ferroelectrics
  • lead-free thin films
  • morphotropic phase boundary
  • super tetragonal nanostructures

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Chemical Engineering(all)
  • Materials Science(all)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)
  • Engineering(all)
  • Physics and Astronomy(all)


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