Addition of the Lewis Acid Zn(C6F5)2 Enables Organic Transistors with a Maximum Hole Mobility in Excess of 20 cm2 V−1 s−1

Alexandra F. Paterson, Leonidas Tsetseris, Ruipeng Li, Aniruddha Basu, Hendrik Faber, Abdul Hamid Emwas, Julianna Panidi, Zhuping Fei, Muhammad R. Niazi, Dalaver H. Anjum, Martin Heeney, Thomas D. Anthopoulos

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

Abstract

Incorporating the molecular organic Lewis acid tris(pentafluorophenyl)borane [B(C6F5)3] into organic semiconductors has shown remarkable promise in recent years for controlling the operating characteristics and performance of various opto/electronic devices, including, light-emitting diodes, solar cells, and organic thin-film transistors (OTFTs). Despite the demonstrated potential, however, to date most of the work has been limited to B(C6F5)3 with the latter serving as the prototypical air-stable molecular Lewis acid system. Herein, the use of bis(pentafluorophenyl)zinc [Zn(C6F5)2] is reported as an alternative Lewis acid additive in high-hole-mobility OTFTs based on small-molecule:polymer blends comprising 2,7-dioctyl[1]benzothieno [3,2-b][1]benzothiophene and indacenodithiophene–benzothiadiazole. Systematic analysis of the materials and device characteristics supports the hypothesis that Zn(C6F5)2 acts simultaneously as a p-dopant and a microstructure modifier. It is proposed that it is the combination of these synergistic effects that leads to OTFTs with a maximum hole mobility value of 21.5 cm2 V−1 s−1. The work not only highlights Zn(C6F5)2 as a promising new additive for next-generation optoelectronic devices, but also opens up new avenues in the search for high-mobility organic semiconductors.

Original languageEnglish
Article number1900871
JournalAdvanced Materials
Volume31
Issue number27
DOIs
StatePublished - Jul 5 2019

Bibliographical note

Publisher Copyright:
© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • Lewis acid
  • carrier mobility
  • molecular doping
  • organic semiconductors
  • organic thin-film transistors

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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