Thermally Activated Aromatic Ionic Dopants (TA-AIDs) Enabling Stable Doping, Orthogonal Processing and Direct Patterning

Zhifan Ke, Mustafa H. Ahmed, Ashkan Abtahi, Shih Hsin Hsu, Wenting Wu, Michael F. Espenship, Kyle N. Baustert, Kenneth R. Graham, Julia Laskin, Liang Pan, Jianguo Mei

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Doping plays a critical role in organic electronics, and dopant design has been central in the development of functional and stable doping. In this study, there is departure from conventional molecular dopants and a new class of dopants are reported – aromatic ionic dopants (AIDs). AIDs consist of a pair of aromatic cation and anion that are responsible for molecular doping reaction and charge balancing separately. It is shown that the first AID made from cycloheptatrienyl (tropylium) cation and pentacyanocyclopentadienide anion (PCCp), abbreviated as T-PCCp, can function as an effective p-type dopant to dope polydioxythiophenes. Here, tropylium cation induces the doping reaction while the PCCp anion stabilizes the generated polarons and bipolarons. With T-PCCp, a highly doped (≈120 S/cm) and stable system is achieved up to 150 °C, an orthogonal (sequential)solution processing resulting from the immiscibility of the dopant and the polymer host, and a high-resolution direct micropatterning with laser writing resulted from a thermally activated doping process.

Original languageEnglish
Article number2211522
JournalAdvanced Functional Materials
Volume33
Issue number8
DOIs
StatePublished - Feb 16 2023

Bibliographical note

Publisher Copyright:
© 2022 The Authors. Advanced Functional Materials published by Wiley-VCH GmbH.

Keywords

  • aromatic ionic dopants
  • conjugated polymers
  • doping
  • organic electronics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Condensed Matter Physics
  • General Materials Science
  • Electrochemistry
  • Biomaterials

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