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Controlled Synthesis of Water-Soluble Conjugated Polyelectrolytes Leading to Excellent Hole Transport Mobility

Title data

Brendel, Johannes C. ; Schmidt, Martina M. ; Hagen, Gunter ; Moos, Ralf ; Thelakkat, Mukundan:
Controlled Synthesis of Water-Soluble Conjugated Polyelectrolytes Leading to Excellent Hole Transport Mobility.
In: Chemistry of Materials. Vol. 26 (2014) Issue 6 . - pp. 1992-1998.
ISSN 1520-5002
DOI: https://doi.org/10.1021/cm500500t

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft
Umweltverträgliche Anwendungen der Nanotechnologie

Abstract in another language

Conjugated polyelectrolytes (CPE) find widespread applications due to their solubility in aqueous systems or highly polar solvents. However, ion reorganization under applied fields and low charge carrier mobility limit their use as active layers in electronic devices. Here, we present a novel controlled synthetic route for CPEs based on polythiophene carrying sulfonate side groups. We prepared three different polymers with varying molecular weights and narrow polydispersity. For the CPE with the highest molecular weight, we observed the formation of small aggregates in aqueous solution which was confirmed by UV–vis absorption and fluorescence spectroscopy. In the UV–vis spectrum, vibrational bands are observed, which are maintained in the thin film. These absorption bands are similar to those of crystalline poly(3-hexylthiophene). The fluorescence signal is almost completely quenched for these aggregates. Adding other polar solvents such as DMSO results in the dissolution of the aggregates indicated by the decrease of the vibrational bands in UV–vis and the increase of the fluorescence signal. This polymer further exhibits a remarkably high hole transport mobility of (1.2 ± 0.5) × 10^–2 cm2/(Vs) as determined by the space charge limited current method. The underlying transport mechanism was studied by current (J)–voltage (V) measurements and impedance spectroscopy. The former shows a quadratic dependence of J vs V and a fast response within microseconds characteristic for a classical semiconductor, while the latter shows no sign of any ion motion. In contrast to other reported CPEs, the regioregular chain conformation and the narrow molecular weight distribution here promote the formation of aggregates which improve the electronic charge transport throughout the bulk. Additionally, the presence of sterically demanding counterions suppress the ion motion and reorganization, resulting in a water-soluble semiconducting material with high hole transport mobility.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP B 7
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I
Research Institutions > Collaborative Research Centers, Research Unit
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Applied Functional Polymers > Professorship Applied Functional Polymers - Univ.-Prof. Dr. Mukundan Thelakkat
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Applied Functional Polymers
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 01 Dec 2014 09:26
Last Modified: 21 Jul 2016 06:38
URI: https://eref.uni-bayreuth.de/id/eprint/3851