Semiconducting Small Molecules as Active Materials for p-Type Accumulation Mode Organic Electrochemical Transistors

Zachary S. Parr, Reem B. Rashid, Bryan D. Paulsen, Benjamin Poggi, Ellasia Tan, Mark Freeley, Matteo Palma, Isaac Abrahams, Jonathan Rivnay, Christian B. Nielsen*

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

A series of semiconducting small molecules with bithiophene or bis-3,4-ethylenedioxythiophene cores are designed and synthesized. The molecules display stable reversible oxidation in solution and can be reversibly oxidized in the solid state with aqueous electrolyte when functionalized with polar triethylene glycol side chains. Evidence of promising ion injection properties observed with cyclic voltammetry is complemented by strong electrochromism probed by spectroelectrochemistry. Blending these molecules with high molecular weight polyethylene oxide (PEO) is found to improve both ion injection and thin film stability. The molecules and their corresponding PEO blends are investigated as active layers in organic electrochemical transistors (OECTs). For the most promising molecule:polymer blend (P4E4:PEO), p-type accumulation mode OECTs with µA drain currents, μS peak transconductances, and a µC* figure-of-merit value of 0.81 F V−1 cm−1 s−1 are obtained.

Original languageEnglish (US)
Article number2000215
JournalAdvanced Electronic Materials
Volume6
Issue number6
DOIs
StatePublished - Jun 1 2020

Keywords

  • mixed ionic-electronic conduction
  • organic electrochemical transistors
  • π-conjugated small molecules

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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    Parr, Z. S., Rashid, R. B., Paulsen, B. D., Poggi, B., Tan, E., Freeley, M., Palma, M., Abrahams, I., Rivnay, J., & Nielsen, C. B. (2020). Semiconducting Small Molecules as Active Materials for p-Type Accumulation Mode Organic Electrochemical Transistors. Advanced Electronic Materials, 6(6), [2000215]. https://doi.org/10.1002/aelm.202000215