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

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Fullerenes
Charge carriers
Vapors
Molecules
Electrons
Photoluminescence
Genetic Recombination
Solar Energy
Solar energy
Conversion efficiency
Energy gap
Thin films
Equipment and Supplies
Organic solar cells

ASJC Scopus subject areas

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

Cite this

Charge carrier dynamics of vapor-deposited small-molecule/fullerene organic solar cells. / Chang, Angela Y.; Chen, Yi Hong; Lin, Hao Wu; Lin, Li Yen; Wong, Ken Tsung; Schaller, Richard D.

In: Journal of the American Chemical Society, Vol. 135, No. 24, 19.06.2013, p. 8790-8793.

Research output: Contribution to journalArticle

Chang, Angela Y. ; Chen, Yi Hong ; Lin, Hao Wu ; Lin, Li Yen ; Wong, Ken Tsung ; Schaller, Richard D. / Charge carrier dynamics of vapor-deposited small-molecule/fullerene organic solar cells. In: Journal of the American Chemical Society. 2013 ; Vol. 135, No. 24. pp. 8790-8793.
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