Structural control of mixed ionic and electronic transport in conducting polymers

Jonathan Rivnay (), Sahika Inal, Brian A. Collins, Michele Sessolo, Eleni Stavrinidou, Xenofon Strakosas, Christopher Tassone, Dean M. Delongchamp and George G. Malliaras
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Jonathan Rivnay: Ecole Nationale Supérieure des Mines, CMP-EMSE, MOC
Sahika Inal: Ecole Nationale Supérieure des Mines, CMP-EMSE, MOC
Brian A. Collins: National Institute of Standards and Technology (NIST)
Michele Sessolo: Instituto de Ciencia Molecular, Universidad de Valencia
Eleni Stavrinidou: Ecole Nationale Supérieure des Mines, CMP-EMSE, MOC
Xenofon Strakosas: Ecole Nationale Supérieure des Mines, CMP-EMSE, MOC
Christopher Tassone: Stanford Synchrotron Radiation Lightsource (SSRL), SLAC National Accelerator Laboratory
Dean M. Delongchamp: National Institute of Standards and Technology (NIST)
George G. Malliaras: Ecole Nationale Supérieure des Mines, CMP-EMSE, MOC

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate), PEDOT:PSS, has been utilized for over two decades as a stable, solution-processable hole conductor. While its hole transport properties have been the subject of intense investigation, recent work has turned to PEDOT:PSS as a mixed ionic/electronic conductor in applications including bioelectronics, energy storage and management, and soft robotics. Conducting polymers can efficiently transport both holes and ions when sufficiently hydrated, however, little is known about the role of morphology on mixed conduction. Here, we show that bulk ionic and electronic mobilities are simultaneously affected by processing-induced changes in nano- and meso-scale structure in PEDOT:PSS films. We quantify domain composition, and find that domain purification on addition of dispersion co-solvents limits ion mobility, even while electronic conductivity improves. We show that an optimal morphology allows for the balanced ionic and electronic transport that is critical for prototypical mixed conductor devices. These findings may pave the way for the rational design of polymeric materials and processing routes to enhance devices reliant on mixed conduction.

Date: 2016
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DOI: 10.1038/ncomms11287

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