Impedance measurements on QLED devices: analysis of high-frequency loop in terms of material properties

Chen You, Alex Titov, Baek Hyun Kim, Mark E. Orazem

Research output: Contribution to journalArticle

Abstract

Electrochemical impedance spectroscopy is used to study red and green quantum-dot light-emitting diodes devices. The high-frequency loop is interpreted in terms of the thickness, dielectric constant, and resistivity distribution of the hole-injection layer. The analysis employed the device capacitance obtained from a measurement model analysis, the film thickness measured by scanning electron microscopy, and an interpretation of the impedance based on a power-law model. Impedance measurements performed on hole-transport–only devices yielded results that were consistent with the interpretation of the high-frequency capacitive loop in terms of the properties of the hole-injection layer.

Original languageEnglish
JournalJournal of Solid State Electrochemistry
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Electrochemical impedance spectroscopy
  • Power-law model
  • Quantum-dot light-emitting diodes
  • Regression analysis

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry
  • Electrical and Electronic Engineering

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