Time-Resolved Structural Kinetics of an Organic Mixed Ionic–Electronic Conductor

Paulsen, Bryan D.; Wu, Ruiheng; Takacs, Christopher J.; Steinrück, Hans‐Georg; Strzalka, Joseph; Zhang, Qingteng; Toney, Michael F.; Rivnay, Jonathan

doi:10.1002/adma.202003404

Time-Resolved Structural Kinetics of an Organic Mixed Ionic–Electronic Conductor

Journal Article · Sun Aug 30 00:00:00 EDT 2020 · Advanced Materials

DOI:https://doi.org/10.1002/adma.202003404· OSTI ID:1659750

^[1]; Wu, Ruiheng ^[1]; ^[2]; Steinrück, Hans‐Georg ^[3]; Strzalka, Joseph ^[4]; Zhang, Qingteng ^[4]; Toney, Michael F. ^[2]; ^[1]

Northwestern Univ., Evanston, IL (United States)
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Univ. Paderborn (Germany)
Argonne National Lab. (ANL), Lemont, IL (United States)

The structure and packing of organic mixed ionic–electronic conductors have an especially significant effect on transport properties. In operating devices, this structure is not fixed but is responsive to changes in electrochemical potential, ion intercalation, and solvent swelling. Toward this end, the steady-state and transient structure of the model organic mixed conductor, poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), is characterized using multimodal time-resolved operando techniques. Steady-state operando X-ray scattering reveals a doping-induced lamellar expansion of 1.6 Å followed by 0.4 Å relaxation at high doping levels. Time-resolved operando X-ray scattering reveals asymmetric rates of lamellar structural change during doping and dedoping that do not directly depend on potential or charging transients. Further, time-resolved spectroscopy establishes a link between structural transients and the complex kinetics of electronic charge carrier subpopulations, in particular the polaron–bipolaron equilibrium. These findings provide insight into the factors limiting the response time of organic mixed-conductor-based devices, and present the first real-time observation of the structural changes during doping and dedoping of a conjugated polymer system via X-ray scattering.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); SLAC National Accelerator Laboratory, Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; AC02-76SF00515

OSTI ID:: 1659750

Alternate ID(s):: OSTI ID: 1785850
OSTI ID: 1686122

Journal Information:: Advanced Materials, Journal Name: Advanced Materials Journal Issue: 40 Vol. 32; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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