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

J. Behrends, A. Schnegg, K. Lips, Elizabeth Alice Thomsen, Ajay K Pandey, Ifor David William Samuel, D. J. Keeble

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)

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.

Original languageEnglish
Article number176601
Number of pages4
JournalPhysical Review Letters
Volume105
Issue number17
DOIs
Publication statusPublished - 19 Oct 2010

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