Ultra-High Energy Storage Performance of Field-Induced Ferroelectric Al2O3-Inserted Hf0.5Zr0.5O2 Thin Films for Electrostatic Supercapacitors

Strategic Insights -

South Korean researchers have made a groundbreaking discovery in the field of energy storage by developing ultra-high energy storage performance thin films for electrostatic supercapacitors. The study, conducted by a team from Seoul National University, has achieved a record-high energy storage density of -138 J cm-3 among planar-structured (Hf,Zr)O2-based thin films, with a high efficiency of -80%. This breakthrough has significant implications for the development of high-performance energy storage devices.

Key Takeaways:

  • The research team has successfully developed ultra-high energy storage performance thin films by adjusting the number of Al2O3 dopant cycles and layer insertion positions.
  • The optimized Al2O3-inserted HZO films exhibit a record-high energy storage density of -138 J cm-3, with a high efficiency of -80%.
  • The films maintain stable energy storage performance over 109 cycles at 6.0 MV cm-1 without electrical breakdown.
  • A single Al2O3 cycle (-0.12 nm) suppresses the monoclinic phase and stabilizes the tetragonal phase, enhancing the field-induced ferroelectric (FFE) switching.
  • Thicker Al2O3 layers (-0.24-0.36 nm) form continuous, non-diffusive layers that hinder FFE tetragonal phase stabilization.
  • The research highlights the critical role of precise Al2O3 insertion in maximizing the energy storage capabilities of (Hf,Zr)O2 thin films.
  • High energy storage density is maintained at fast discharge times below 1 μs, making it an efficient metric for future evaluations.

Statistics:

  • Record-high energy storage density of -138 J cm-3 achieved among planar-structured (Hf,Zr)O2-based thin films.
  • High efficiency of -80% achieved by optimizing Al2O3-inserted HZO films.
  • Stable energy storage performance maintained over 109 cycles at 6.0 MV cm-1.
  • Effective discharge time is proposed as an efficient metric for future evaluations, with values below 1 μs.

Sources:

  • NewsRx. Investigators from Seoul National University Have Reported New Data on Energy Storage (Ultra-high Energy Storage Performance of Field-induced Ferroelectric Al2o3-inserted Hf0.5zr0.5o2 Thin Films for Electrostatic Supercapacitors). Energy Weekly News. July 11, 2025; p 352.
  • "Ultra-high Energy Storage Performance of Field-induced Ferroelectric Al2o3-inserted Hf0.5zr0.5o2 Thin Films for Electrostatic Supercapacitors." Energy Storage Materials, 2025;79.