Double Doping of a Low-Ionization-Energy Polythiophene with a Molybdenum Dithiolene Complex
Artikel i vetenskaplig tidskrift, 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.
Författare
Emmy Järsvall
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Till Biskup
Universität des Saarlandes
Yadong Zhang
University of Colorado
Georgia Institute of Technology
Renee Kroon
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Linköpings universitet
Stephen Barlow
Georgia Institute of Technology
University of Colorado
Seth R. Marder
University of Colorado
Ctr Organ Photon & Elect
Georgia Institute of Technology
Christian Müller
Chalmers, Kemi och kemiteknik, Tillämpad kemi
Chemistry of Materials
0897-4756 (ISSN) 1520-5002 (eISSN)
Vol. 34 12 5673-5679Ämneskategorier (SSIF 2011)
Kemiteknik
Materialkemi
DOI
10.1021/acs.chemmater.2c01040
PubMed
35782206