Bipolaron formation in organic solar cells observed by pulsed electrically detected magnetic resonance

Behrends, J., Schnegg, A., Lips, K., Thomsen, E. A., Pandey, A. K., Samuel, I. D. W. and Keeble, D. J. (2010) Bipolaron formation in organic solar cells observed by pulsed electrically detected magnetic resonance. Physical Review Letters, 105 17: 176601-1-176601-4. doi:10.1103/PhysRevLett.105.176601

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Author Behrends, J.
Schnegg, A.
Lips, K.
Thomsen, E. A.
Pandey, A. K.
Samuel, I. D. W.
Keeble, D. J.
Title Bipolaron formation in organic solar cells observed by pulsed electrically detected magnetic resonance
Journal name Physical Review Letters   Check publisher's open access policy
ISSN 0031-9007
1079-7114
Publication date 2010-10-22
Sub-type Article (original research)
DOI 10.1103/PhysRevLett.105.176601
Open Access Status File (Publisher version)
Volume 105
Issue 17
Start page 176601-1
End page 176601-4
Total pages 4
Place of publication College Park, MD, U.S.A
Publisher American Physical Society
Language eng
Formatted abstract
We report the observation of a spin-dependent dark transport current, exhibiting spin coherence at room temperature, in a π-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.
© 2010 The American Physical Society.
Keyword Radical pairs
Meh-Ppv
Semiconductors
Polymer
Magnetoresistance
Excitons
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Chemistry and Molecular Biosciences
 
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Created: Fri, 08 Apr 2011, 19:55:23 EST by Dr Ajay Pandey on behalf of School of Chemistry & Molecular Biosciences