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Role of Electron Blocking Layer in Performance Improvement of Organic Diodes

  • E. Hleli
  • M. Radaoui
  • Z. Ben HamedEmail author
  • S. Romdhane
  • D. A. M. Egbe
  • H. Bouchriha
Article
  • 5 Downloads

Abstract

Charge-carrier mobilities in organic diodes based on an anthracene-containing poly(arylene-ethynylene)-alt-poly(p-phenylene-vinylene) generally known as AnE-PVstat, stacked with an electron blocking thin layer of NPB(N, N′-bis (1-naphythyl)-N, N-diphenyl-1,1′-biphenyl-4,4′-diamin) of various thicknesses are investigated through current density-voltage (J-V), capacitance-frequency (C-w), conductance-frequency (G-w) and impedance-frequency (Z-w) experiments in conventional structures of ITO/AnE-PVstat/NPB/Al. Analysis of J-V, C-w and G-w results show that current-density, capacitance and conductance of the active layer decrease with increasing NPB thickness and permit determination separately of a hole mobility of the polymer of the order of \( \sim10^{ - 4} \,{\hbox{cm}}^{2}\, {\hbox{V}}^{ - 1} \,{\hbox{s}}^{ - 1} \). This value is less than the global mobility (7 × 10−4 \( {\hbox{cm}}^{2} \,{\hbox{V}}^{ - 1} \,{\hbox{s}}^{ - 1} \)) obtained without the blocking layer, which probably includes electrons and holes mobilities and indicates that NPB absorbs the majority of electrons. Analysis of impedance spectroscopy results shows that the impedance (Z) and parallel capacitor (Cp) decrease and parallel resistance (Rp) increases with increasing NPB thickness layer. All these results clearly confirm the role of NPB as a blocking layer for the electrons.

Keywords

Current-voltage (I-Vimpedance spectroscopy AnE-PVstat NPB electron blocking layer 

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • E. Hleli
    • 1
  • M. Radaoui
    • 1
    • 2
  • Z. Ben Hamed
    • 1
    Email author
  • S. Romdhane
    • 1
    • 3
  • D. A. M. Egbe
    • 4
  • H. Bouchriha
    • 1
  1. 1.Advanced Materials and Quantum Phenomena, Faculty of Sciences of TunisUniversity Tunis El ManarTunisTunisia
  2. 2.Faculté of Sciences of GafsaGafsaTunisia
  3. 3.Faculty of Sciences of BizerteUniversity of CarthageBizerteTunisia
  4. 4.Institute of Polymeric Materials and TestingJohannes Kepler UniversityLinzAustria

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