Chemical Doping of Conjugated Polymers with the Strong Oxidant Magic Blue
Journal article, 2020

Molecular doping of organic semiconductors is a powerful tool for the optimization of organic electronic devices and organic thermoelectric materials. However, there are few redox dopants that have a sufficiently high electron affinity to allow the doping of conjugated polymers with an ionization energy of more than 5.3 eV. Here, p-doping of a broad palette of conjugated polymers with high ionization energies is achieved by using the strong oxidant tris(4-bromophenyl)ammoniumyl hexachloroantimonate (Magic Blue). In particular diketopyrrolopyrrole (DPP)-based copolymers reach a conductivity of up to 100 S cm−1 and a thermoelectric power factor of 10 µW m−1 K−2. Further, both electron paramagnetic resonance (EPR) as well as a combination of spectroelectrochemistry and chronoamperometry is used to estimate the charge-carrier density of the polymer PDPP-3T doped with Magic Blue. A molar attenuation coefficient of 6.0 ± 0.2 × 103 m2 mol−1 is obtained for the first polaronic sub-bandgap absorption of electrochemically oxidized PDPP-3T. Comparison with chemically doped PDPP-3T suggests a charge-carrier density on the order of 1026 m−3, which yields a charge-carrier mobility of up to 0.5 cm2 V−1 s−1 for the most heavily doped material.

charge-carrier density

conjugated polymers

electrochemical doping

organic thermoelectrics

chemical doping

magic blue

Author

Anna Hofmann

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Renee Kroon

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Sepideh Zokaei

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Emmy Järsvall

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Claudia Malacrida

Institute for Polymer Chemistry

Sabine Ludwigs

Institute for Polymer Chemistry

Till Biskup

Universität des Saarlandes

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Advanced Electronic Materials

2199-160X (ISSN) 2199160x (eISSN)

Vol. 6 8 2000249

Subject Categories

Materials Chemistry

Theoretical Chemistry

Condensed Matter Physics

DOI

10.1002/aelm.202000249

More information

Latest update

9/15/2020