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Time‐Resolved Structural Kinetics of an Organic Mixed Ionic–Electronic Conductor
- Source :
- Advanced Materials. 32:2003404
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- 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. 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.
- Subjects :
- chemistry.chemical_classification
Materials science
Scattering
Mechanical Engineering
Doping
Ionic bonding
02 engineering and technology
Polymer
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Polystyrene sulfonate
chemistry.chemical_compound
chemistry
PEDOT:PSS
Mechanics of Materials
Chemical physics
General Materials Science
Lamellar structure
0210 nano-technology
Electrochemical potential
Subjects
Details
- ISSN :
- 15214095 and 09359648
- Volume :
- 32
- Database :
- OpenAIRE
- Journal :
- Advanced Materials
- Accession number :
- edsair.doi.dedup.....af10a2875f2e1569407774a81f50bda0