Impact of unintentional oxygen doping on organic photodetectors

Julie Euvrard, Amélie Revaux, Alexandra Cantarano, Stéphanie Jacob, Antoine Kahn, Dominique Vuillaume

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Oxygen plasma is a widely used treatment to change the surface properties of organic layers. This treatment is particularly interesting to enable the deposition from solution of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) on top of the active layer of organic solar cells or photodetectors. However, oxygen is known to be detrimental to organic devices, as the active layer is very sensitive to oxygen and photo-oxidation. In this study, we aim to determine the impact of oxygen plasma surface treatment on the performance of organic photodetectors (OPD). We show a significant reduction of the sensitivity as well as a change in the shape of the external quantum efficiency (EQE) of the device. Using hole density and conductivity measurements, we demonstrate the p-doping of the active layer induced by oxygen plasma. Admittance spectroscopy shows the formation of trap states approximately 350 meV above the highest occupied molecular orbital of the active organic semiconductor layer. Numerical simulations are carried out to understand the impact of p-doping and traps on the electrical characteristics and performance of the OPDs.

Original languageEnglish (US)
Pages (from-to)64-71
Number of pages8
JournalOrganic Electronics
Volume54
DOIs
StatePublished - Mar 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Keywords

  • Organic photodetectors
  • Oxygen
  • p-doping

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  • Cite this

    Euvrard, J., Revaux, A., Cantarano, A., Jacob, S., Kahn, A., & Vuillaume, D. (2018). Impact of unintentional oxygen doping on organic photodetectors. Organic Electronics, 54, 64-71. https://doi.org/10.1016/j.orgel.2017.12.008