Double Doping of a Low-Ionization-Energy Polythiophene with a Molybdenum Dithiolene Complex
Journal article, 2022

Doping of organic semiconductors is crucial for tuning the charge-carrier density of conjugated polymers. The exchange of more than one electron between a monomeric dopant and an organic semiconductor allows the polaron density to be increased relative to the number of counterions that are introduced into the host matrix. Here, a molybdenum dithiolene complex with a high electron affinity of 5.5 eV is shown to accept two electrons from a polythiophene that has a low ionization energy of 4.7 eV. Double p-doping is consistent with the ability of the monoanion salt of the molybdenum dithiolene complex to dope the polymer. The transfer of two electrons to the neutral dopant was also confirmed by electron paramagnetic resonance spectroscopy since the monoanion, but not the dianion, of the molybdenum dithiolene complex features an unpaired electron. Double doping allowed an ionization efficiency of 200% to be reached, which facilitates the design of strongly doped semiconductors while lessening any counterion-induced disruption of the nanostructure.

Author

Emmy Järsvall

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Till Biskup

Universität des Saarlandes

Yadong Zhang

Georgia Institute of Technology

University of Colorado

Renee Kroon

Linköping University

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Stephen Barlow

University of Colorado

Georgia Institute of Technology

Seth R. Marder

Ctr Organ Photon & Elect

University of Colorado at Boulder

Georgia Institute of Technology

Christian Müller

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry

Chemistry of Materials

0897-4756 (ISSN) 1520-5002 (eISSN)

Vol. 34 12 5673-5679

Subject Categories

Chemical Engineering

Materials Chemistry

DOI

10.1021/acs.chemmater.2c01040

PubMed

35782206

More information

Latest update

7/26/2022