Doping of Conjugated Polymers by Lewis Acids
Thuc-Quyen Nguyen a
a Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, US, Santa Bárbara, California 93106, EE. UU., Santa Bárbara, United States
Proceedings of Interfaces in Organic and Hybrid Thin-Film Optoelectronics (INFORM)
València, Spain, 2019 March 5th - 7th
Organizers: Natalie Stingelin, Henk Bolink and Michele Sessolo
Invited Speaker, Thuc-Quyen Nguyen, presentation 004
DOI: https://doi.org/10.29363/nanoge.inform.2019.004
Publication date: 8th January 2019

The ability to precisely control the equilibrium carrier concentration in organic semiconducting devices is of great interest. The ability to solution process doped layers is of extreme importance for high throughput production of organic electronic devices via roll-to-roll or ink-jet printing. In this talk, I will discuss doping in conjugated polymers containing Lewis basic sites and the effects of doping on optical property and conductivity. The pyridine moiety on the polymer provides an accessible lone-pair of electrons that can associate with the Lewis acid. Under these circumstances, Lewis acid withdraws electron density from the pyridine moiety leading to a lower energy charge-transfer band. Addition of pyridine regenerates the spectra of pristine polymer due to the formation of the pyridine-Lewis acid adduct and liberation of the parent polymer, demonstrating that the binding is reversible. Addition of the Lewis acid effectively p-dopes the hole transport in the parent polymer, leading to increases in the free hole density and conductivity. This methodology is advantageous since the polymer, Lewis acid, and the adduct have excellent solubility in organic solvents, negating the need for co-solvents that uses in molecular dopant such as F4TCNQ.

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