Charge carrier dynamics of vapor-deposited small-molecule/fullerene organic solar cells

Angela Y. Chang, Yi Hong Chen, Hao Wu Lin, Li Yen Lin, Ken Tsung Wong, Richard D. Schaller

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Although small-molecule organic solar cells (SMOSCs) have shown increasingly promising prospects as a source of solar power, there have been few studies concerning the photophysics of these systems. Here, we report the time scale and efficiency of charge separation and recombination in a vapor-deposited SMOSC material that produces 5.81% power conversion efficiency. Transient absorption and time-resolved photoluminescence (trPL) studies of thin film blends comprising DTDCTB, a narrow-band gap electron donor, and either C 60 or C70 as an electron acceptor show that charge separation occurs in ∼100 fs, while charge recombination takes place over sub-ns and ns time scales. trPL indicates a donor electron-hole pair lifetime of ∼33 ps in the neat film and reveals that ∼20% of donors fail to charge separate in donor-acceptor mixed films, likely owing to some spatially extended donor-rich regions that interact poorly with acceptors. Our results suggest that morphological manipulations of this material could further improve device efficiency.

Original languageEnglish
Pages (from-to)8790-8793
Number of pages4
JournalJournal of the American Chemical Society
Volume135
Issue number24
DOIs
Publication statusPublished - Jun 19 2013

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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