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Conjugated Polyions Enable Organic Photovoltaics Processed from Green Solvents
journal contribution
posted on 2019-02-08, 00:00 authored by Gang Ye, Nutifafa Y. Doumon, Sylvia Rousseva, Yuru Liu, Mustapha Abdu-Aguye, Maria A. Loi, Jan C. Hummelen, L. Jan Anton Koster, Ryan C. ChiechiThis paper describes
the design, synthesis, and optical and electronic properties of two
conjugated polymers CPIZ-B and CPIZ-T that
incorporate closed-shell cations into their conjugated backbones,
balanced by anionic pendant groups. The zwitterionic nature of the
polymers renders them soluble in and processable from polar, protic
solvents to form semiconducting films that are not doped. These unique
properties are confirmed by absorption and electron paramagnetic resonance
spectroscopy. The energies of the unoccupied states respond to the
tritylium moieties in the conjugated backbone, while the occupied
states respond to the electron-donating ability of the uncharged,
aromatic units in the backbone. Films cast from 80:20 HCOOH/H2O by volume show good electron mobilities, enabling a photovoltaic
effect in proof-of-concept, bilayer solar cells.
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zwitterionic naturependant groupspolymers CPIZ-Bresonance spectroscopytritylium moietiesphotovoltaic effectCPIZ-TFilms castform semiconducting filmsvolume showConjugated Polyions Enable Organic Photovoltaics Processedclosed-shell cationsprotic solventselectron mobilitiesGreen Solventselectron-donating abilityHCOOH
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