Conjugated Polyions Enable Organic Photovoltaics Processed from Green Solvents

Ye, G., Doumon, N. Y., Rousseva, S., Liu, Y., Abdu-Aguye, M., Loi, M. A., Hummelen, J. C., Koster, L. J. A. & Chiechi, R. C., 25-Mar-2019, In : ACS Applied Energy Materials. 2, 3, p. 2197-2204 15 p.

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This 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.

Original languageEnglish
Pages (from-to)2197-2204
Number of pages15
JournalACS Applied Energy Materials
Issue number3
Publication statusPublished - 25-Mar-2019


  • conjugated polyions, opto-electronic devices, organic photovoltaics, intrinsic semiconductor, spinless doping, POLYMER SOLAR-CELLS, HIGH-EFFICIENCY, POLYELECTROLYTES, PERFORMANCE, CHARGE, TRANSPORT, DENSITY

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