Charge transfer from delocalized excited states in a bulk heterojunction material

Loren G. Kaake, Daniel Moses, and Alan J. Heeger
Phys. Rev. B 91, 075436 – Published 26 February 2015

Abstract

Charge generation in an organic photovoltaic blend was investigated using transient absorption spectroscopy. In films of pure electron donating material, subpicosecond spectral oscillations were observed and assigned to torsional modes associated with excited state relaxation and localization. These modes are systematically suppressed in the presence of fullerene, indicating that a significant fraction of charge transfer occurs prior to excited state localization.

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  • Received 23 November 2014
  • Revised 14 January 2015

DOI:https://doi.org/10.1103/PhysRevB.91.075436

©2015 American Physical Society

Authors & Affiliations

Loren G. Kaake1, Daniel Moses2, and Alan J. Heeger2,3,4

  • 1Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A1S6
  • 2Center for Polymers and Organic Solids, University of California Santa Barbara, California, 93106-5090, USA
  • 3Department of Chemistry, University of California Santa Barbara, California, 93106-9510, USA
  • 4Department of Physics, University of California Santa Barbara, California, 93106-9530, USA

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Issue

Vol. 91, Iss. 7 — 15 February 2015

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