Plasticization of PEDOT:PSS by common additives for mechanically robust organic solar cells and wearable sensors

Suchol Savagatrup, Esther Chan, Sandro M. Renteria-Garcia, Adam D. Printz, Aliaksandr V. Zaretski, Timothy F. O'Connor, Daniel Rodriquez, Eduardo Valle, Darren J. Lipomi

Research output: Contribution to journalArticlepeer-review

285 Scopus citations

Abstract

Despite the ubiquity of poly(3,4-ethylenedioxythiophene):poly(styrenesulf onate) (PEDOT:PSS) in applications demanding mechanical flexibility, the effect on the mechanical properties of common additives - i.e., dimethylsulfoxide (DMSO), Zonyl fluorosurfactant (Zonyl), and poly(ethyleneimine) (PEI) - has not been reported. This paper describes these effects and uses plasticized films in solar cells and mechanical sensors for the detection of human motion. The tensile moduli of films spin-coated from solutions containing 0%, 5%, and 10% DMSO and 0.1%, 1%, and 10% Zonyl (nine samples total) are measured using the buckling technique, and the ductility is inferred from measurements of the strain at which cracks form on elastic substrates. Elasticity and ductility are maximized in films deposited from solutions containing 5% DMSO and 10% Zonyl, but the conductivity is greatest for samples containing 0.1% Zonyl. These experiments reveal enlargement of presumably PEDOT-rich grains, visible by atomic force microscopy, when the amount of DMSO is increased from 0% to 5%. PEI - which is used to lower the work function of PEDOT:PSS - has a detrimental effect on the mechanical properties of the PEDOT:PSS/PEI bilayer films. Wearable electronic sensors employing PEDOT:PSS films containing 5% DMSO and 10% Zonyl are fabricated, which exhibit detectable responses at 20% strain and high mechanical robustness through elastic deformation.

Original languageEnglish (US)
Pages (from-to)427-436
Number of pages10
JournalAdvanced Functional Materials
Volume25
Issue number3
DOIs
StatePublished - Jan 21 2015
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics

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