Ultrafast Long-Range Charge Separation in Nonfullerene Organic Solar Cells

Yasunari Tamai, Yeli Fan, Vincent O. Kim, Kostiantyn Ziabrev, Akshay Rao, Stephen Barlow, Seth R. Marder, Richard H. Friend, S. Matthew Menke

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

Rapid, long-range charge separation in polymer-fullerene organic solar cells (OSCs) enables electrons and holes to move beyond their Coulomb capture radius and overcome geminate recombination. Understanding the nature of charge generation and recombination mechanisms in efficient, nonfullerene-acceptor-based OSCs are critical to further improve device performance. Here we report charge dynamics in an OSC using a perylene diimide (PDI) dimer acceptor. We use transient absorption spectroscopy to track the time evolution of electroabsorption caused by the dipolar electric field generated between electron-hole pairs as they separate after ionization at the donor-acceptor interface. We show that charges separate rapidly (
Original languageEnglish (US)
Pages (from-to)12473-12481
Number of pages9
JournalACS Nano
Volume11
Issue number12
DOIs
StatePublished - Nov 17 2017
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Materials Science(all)
  • Engineering(all)

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