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Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance

Bipolaron Formation in Organic Solar Cells Observed by Pulsed Electrically Detected Magnetic Resonance

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Authors

  • J. Behrends
  • A. Schnegg
  • K. Lips
  • E. A. Thomsen
  • A. K. Pandey
  • I. D. W. Samuel
  • D. J. Keeble

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Original languageEnglish
???articleNumber???176601
Pages-
Number of pages4
JournalPhysical Review Letters
Journal publication date19 Oct 2010
Journal number17
Volume105
DOIs
StatePublished

Abstract

We report the observation of a spin-dependent dark transport current, exhibiting spin coherence at room temperature, in a pi-conjugated polymer-fullerene blend using pulsed electrically detected magnetic resonance. The resonance at g = 2.0028(3) is due to polarons in the polymer, and exhibits spin locking at high microwave fields. The presence of an excess of fullerene, and the operating voltage (1 V) used, suppresses negative polaron formation in the polymer. It is concluded that spin-dependent transport is due to the formation of positive bipolarons.

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