Conjugated Polyions Enable Organic Photovoltaics Processed from Green Solvents

Gang Ye, Nutifafa Y. Doumon, Sylvia Rousseva, Yuru Liu, Mustapha Abdu-Aguye, Maria A. Loi, Jan C. Hummelen, L. Jan Anton Koster, Ryan C. Chiechi

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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 (US)
Pages (from-to)2197-2204
Number of pages8
JournalACS Applied Energy Materials
Issue number3
StatePublished - Mar 25 2019

All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Electrical and Electronic Engineering
  • Electrochemistry


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