Electron-ion interaction in doped conducting polymers

Prigodin, V. N.; Hsu, Fang‐Chi; Park, J. H.; Waldmann, Oliver; Epstein, Arthur J.

doi:10.1103/physrevb.78.035203

Cited by 42 publications

(39 citation statements)

References 48 publications

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“…Despite the difference in architecture of those devices, the underlying physics is identical and common with cyclic voltammetry analysis. In particular, models utilized for explaining experimental results do not typically assume any redox reactions and are solely based on the coupling between electronic and ionic motion as described by the Nernst-Planck-Poisson equations (drift-diffusion equations) [68,69,70].…”

Section: Charge Transport Models For Conductive Polymersmentioning

confidence: 99%

Ionic and electronic transport in electrochemical and polymer based systems

Volkov

2017

Linköping Studies in Science and Technology. Dissertations

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Description of the cover image:An ion exchange membrane Ionic and electronic transport in electrochemical and polymer based systemsCopyright © 2017 Anton Volkov (unless otherwise noted) Division of Physics and Electronics Department of Science and TechnologyLinköping University SE-601 74 Norrköping, Sweden Norrköping, March 2017 ISBN: 978-91-7685-548-5 ISSN 0345-7524 Printed in Sweden by LiU-Tryck, Linköping, 2017 Electronic publication: www.ep.liu.seTo my parents, Alla and Vyacheslav. AbstractElectrochemical systems, which rely on coupled phenomena of the chemical change and electricity, have been utilized for development an interface between biological systems and conventional electronics. The development and detailed understanding of the operation mechanism of such interfaces have a great importance to many fields within life science and conventional electronics. Conducting polymer materials are extensively used as a building block in various applications due to their ability to transduce chemical signal to electrical one and vice versa. The mechanism of the coupling between the mass and charge transfer in electrochemical systems, and particularly in conductive polymer based system, is highly complex and depends on various physical and chemical properties of the materials composing the system of interest.The aims of this thesis have been to study electrochemical systems including conductive polymer based systems and provide knowledge for future development of the devices, which can operate with both chemical and electrical signals. Within the thesis, we studied the operation mechanism of ion bipolar junction transistor (IBJT), which have been previously utilized to modulate delivery of charged molecules. We analysed the different operation modes of IBJT and transition between them on the basis of detailed concentration and potential profiles provided by the model.We also performed investigation of capacitive charging in conductive PEDOT:PSS polymer electrode. We demonstrated that capacitive charging of PEDOT:PSS electrode at the cyclic voltammetry, can be understood within a modified Nernst-Planck-Poisson formalism for two phase system in terms of the coupled ion-electron diffusion and migration without invoking the assumption of any redox reactions.Further, we studied electronic structure and optical properties of a self-doped p-type conducting polymer, which can polymerize itself along the stem of the plants. We performed ab initio calculations for this system in undoped, polaron and bipolaron electronic states.Comparison with experimental data confirmed the formation of undoped or bipolaron states in polymer film depending on applied biases.Finally, we performed simulation of the reduction-oxidation reaction at microband array electrodes. We showed that faradaic current density at microband array electrodes increases due to non-linear mass transport on the microscale compared to the corresponding macroscale systems. The studied microband array electrode was used for developing a laccase-based micro...

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Section: Charge Transport Models For Conductive Polymersmentioning

confidence: 99%

Ionic and electronic transport in electrochemical and polymer based systems

Volkov

2017

Linköping Studies in Science and Technology. Dissertations

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“…For technological applications, for example, as antistatic, anticorrosive, or conducting paint, a persistent, high, and homogeneous level of doping is required. Conductivities up to a few hundred Siemens per centimeter can be reached for the conducting polymers poly(aniline), poly(pyrrole) and PEDOT:PSS (poly(3,4-ethylene dioxythiophene)-polystyrene sulfonic acid), a mixture of two polymers [42][43][44][45][46][47][48] (Figure 1.7). A basic introduction to conducting polymers, focused on PEDOT:PSS, can be found in [49].…”

Section: Box 12 Polymer Structures and Their Namesmentioning

confidence: 99%

The Electronic Structure of Organic Semiconductors

2015

Electronic Processes in Organic Semiconductors

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“…This is no longer true in the case of highly doped materials that are metallic or quasi-metallic such as PEDOT [202][203][204][205][206][207][208][209]. Under this premise, the nature of the charge transport remains unaffected though the shape of the DOSs may be altered by the dopant.…”

Section: By Dopingmentioning

confidence: 99%

Charges and Excited States in Organic Semiconductors

Köhler

Bäßler

2015

Electronic Processes in Organic Semiconductors

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In Chapter 1, we discussed how light interacts with a molecule and thereby creates an excited state. The part of the molecule that absorbs light is termed a chromophore. A chromophore may comprise (i) the π-conjugated core of a molecule without any non-conjugated side chains, or (ii) an electronically coherent part in a π-conjugated polymer chain. In this chapter, we explore how the nature of the excited state in a chromophore is affected by the chromophore's environment and the way in which the chromophores are arranged with respect to each other. The species formed upon excitation of a neutral chromophore is commonly referred to as neutral excitation. The term charged excitation is associated with the chromophore in a charged state and shall be discussed in Section 2.4. Excited Molecules from the Gas Phase to the Amorphous FilmA good starting point to understand excited states in organic semiconductors is to follow the changes that are associated with having a single excited molecule in different environments. In order to correctly interpret spectra it is essential to know how and why the absorption and luminescence spectra of molecules change when going from the bare molecule, present in the gas phase, to the molecule embedded in an environment, as given in the condensed phase. The starting point is therefore given by the gas phase spectra. Absorption and fluorescence (FL) spectra of aromatic molecules used in optoelectronic devices are not routinely measured in the gas phase. We shall consider the tetracene molecule as a model object because this molecule has been investigated in the gas phase, in solid and liquid solution, in an amorphous as well as in a crystalline phase. Moreover, in bulk films and in the crystal, singlet excitations of tetracene and its derivatives can undergo fission into pair of triplets states, which will turn out to be an important process in organic solar cells (OSCs) [1-3]. Effects due to PolarizationFirst, let us consider how the absorption and FL spectra of the bare, isolated molecule evolve when it becomes surrounded by inert noble gas atoms. The prototypical experiment to study this involves the use of supersonic expansion beams [4]. Pioneering work has been carried out in the 1980s by the Jortner group in Tel Aviv [5]. The basic setup of the experiment is shown in Figure 2.1a. Two adjacent chambers are connected by a small outlet, for instance, an outlet of 150 μm diameter. One chamber is filled with an inert gas such as argon and kept at a certain stagnation pressure, while the second chamber is kept under a dynamic vacuum. As the argon escapes through the outlet from the full into the empty chamber, it forms a supersonic expanding beam. Typically, one investigates not pure argon but rather a mixture formed by the carrier gas argon and the vapor of the molecule of interest. The Jortner group conducted the experiment by placing tetracene into the argon-filled sample chamber and heating it to 220 ∘ C where tetracene has a vapor pressure of about 0.1 mbar. They

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Electron-ion interaction in doped conducting polymers

Cited by 42 publications

References 48 publications

Ionic and electronic transport in electrochemical and polymer based systems

Ionic and electronic transport in electrochemical and polymer based systems

The Electronic Structure of Organic Semiconductors

Charges and Excited States in Organic Semiconductors

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