Enhancement-mode PEDOT:PSS organic electrochemical transistors using molecular de-doping

Scott T. Keene, Tom P.A. van der Pol, Dante Zakhidov, Christ H.L. Weijtens, René A.J. Janssen, Alberto Salleo (Corresponding author), Yoeri van de Burgt (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Organic electrochemical transistors (OECTs) show great promise for flexible, low-cost, and low-voltage sensors for aqueous solutions. The majority of OECT devices are made using the polymer blend poly(ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), in which PEDOT is intrinsically doped due to inclusion of PSS. Because of this intrinsic doping, PEDOT:PSS OECTs generally operate in depletion mode, which results in a higher power consumption and limits stability. Here, a straightforward method to de-dope PEDOT:PSS using commercially available amine-based molecular de-dopants to achieve stable enhancement-mode OECTs is presented. The enhancement-mode OECTs show mobilities near that of pristine PEDOT:PSS (≈2 cm2 V−1 s−1) with stable operation over 1000 on/off cycles. The electron and proton exchange among PEDOT, PSS, and the molecular de-dopants are characterized to reveal the underlying chemical mechanism of the threshold voltage shift to negative voltages. Finally, the effect of the de-doping on the microstructure of the spin-cast PEDOT:PSS films is investigated.

Original languageEnglish
Article number2000270
Number of pages8
JournalAdvanced Materials
Volume32
Issue number19
Early online date23 Mar 2020
DOIs
Publication statusPublished - May 2020

Keywords

  • aliphatic amines
  • bioelectronics
  • enhancement-mode transistor
  • molecular doping
  • organic electrochemical transistor
  • poly(ethylenedioxythiophene):poly(styrene sulfonate

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