Inter-Fullerene Electronic Coupling Controls the Efficiency of Photoinduced Charge Generation in Organic Bulk Heterojunctions

Bryon W. Larson, Obadiah G. Reid, David C. Coffey, Stanislav M. Avdoshenko, Alexey A. Popov, Olga V. Boltalina, Steven H. Strauss, Nikos Kopidakis, Garry Rumbles

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Photoinduced charge generation (PCG) dynamics are notoriously difficult to correlate with specific molecular properties in device relevant polymer:fullerene organic photovoltaic blend films due to the highly complex nature of the solid state blend morphology. Here, this study uses six judiciously selected trifluoromethylfullerenes blended with the prototypical polymer poly(3-hexylthiophene) and measure the PCG dynamics in 50 fs–500 ns time scales with time-resolved microwave conductivity and femtosecond transient absorption spectroscopy. The isomeric purity and thorough chemical characterization of the fullerenes used in this study allow for a detailed correlation between molecular properties, driving force, local intermolecular electronic coupling and, ultimately, the efficiency of PCG yield. The findings show that the molecular design of the fullerene not only determines inter-fullerene electronic coupling, but also influences the decay dynamics of free holes in the donor phase even when the polymer microstructure remains unchanged.

Original languageEnglish
Article number1601427
JournalAdvanced Energy Materials
Volume6
Issue number24
DOIs
Publication statusPublished - Dec 21 2016

Keywords

  • charge separation
  • electronic coupling
  • fullerene
  • organic photovoltaics
  • polymer solar cells

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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    Larson, B. W., Reid, O. G., Coffey, D. C., Avdoshenko, S. M., Popov, A. A., Boltalina, O. V., Strauss, S. H., Kopidakis, N., & Rumbles, G. (2016). Inter-Fullerene Electronic Coupling Controls the Efficiency of Photoinduced Charge Generation in Organic Bulk Heterojunctions. Advanced Energy Materials, 6(24), [1601427]. https://doi.org/10.1002/aenm.201601427