Jump to main content
Jump to site search

Issue 48, 2017
Previous Article Next Article

High-energy-density hybrid sol–gel dielectric film capacitors with a polymeric charge blocking layer

Author affiliations

Abstract

We report dielectric and energy storage characteristics of a bilayer structure based on a hybrid dielectric sol–gel film with a polymeric charge blocking layer. Poly(p-phenylene oxide) (PPO) serves as an interfacial charge blocking layer that suppresses charge injection from a metal electrode into the sol–gel dielectric film based on 2-cyanoethyltrimethoxysilane (CNETMS). The charge blocking layer reduces leakage current in the PPO–CNETMS bilayer film capacitor by more than one order of magnitude, and consequently leads to a maximum discharged energy density of 31 J cm−3 at 670 V μm−1, determined by a charge–discharge measurement. Analysis of the field-dependent polarization reveals that the PPO–CNETMS bilayer films exhibit significantly reduced polarization hysteresis upon charge/discharge cycles, so that the energy extraction efficiency remains higher than that of a neat CNETMS sol–gel film throughout the entire electric field range. We attribute this enhancement to the heightened and widened potential energy barrier at the metal–dielectric interface by the low-loss PPO interlayer. Detailed investigation on the height and width of a potential energy barrier at the metal–dielectric interface, by varying the work function of an electrode (potential energy barrier at zero bias) and the thickness of the PPO layer, indicates the critical role of interface energetics in the energy storage performance of dielectric film capacitors for pulsed power applications.

Graphical abstract: High-energy-density hybrid sol–gel dielectric film capacitors with a polymeric charge blocking layer

Back to tab navigation

Publication details

The article was received on 31 Jul 2017, accepted on 01 Nov 2017 and first published on 02 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA06750J
Citation: J. Mater. Chem. A, 2017,5, 25522-25528
  •   Request permissions

    High-energy-density hybrid sol–gel dielectric film capacitors with a polymeric charge blocking layer

    Y. Kim, M. Kathaperumal, Y. Park, M. Pan and J. W. Perry, J. Mater. Chem. A, 2017, 5, 25522
    DOI: 10.1039/C7TA06750J

Search articles by author

Spotlight

Advertisements