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Rapid Research Letter

Photoinduced C70 radical anions in polymer:fullerene blends

  1. Andreas Sperlich1,*,
  2. Moritz Liedtke1,2,
  3. Julia Kern1,
  4. Hannes Kraus1,
  5. Carsten Deibel1,
  6. Salvatore Filippone3,
  7. Juan Luis Delgado3,4,
  8. Nazario Martín3,4,
  9. Vladimir Dyakonov1,2

Article first published online: 10 FEB 2011

DOI: 10.1002/pssr.201105030

Issue

physica status solidi (RRL) - Rapid Research Letters

physica status solidi (RRL) - Rapid Research Letters

Volume 5, Issue 3, pages 128–130, March 2011

Additional Information

How to Cite

Sperlich, A., Liedtke, M., Kern, J., Kraus, H., Deibel, C., Filippone, S., Delgado, J. L., Martín, N. and Dyakonov, V. (2011), Photoinduced C70 radical anions in polymer:fullerene blends. Phys. Status Solidi RRL, 5: 128–130. doi: 10.1002/pssr.201105030

Author Information

  1. 1

    Experimental Physics VI, Julius-Maximilians University of Würzburg, 97074 Würzburg, Germany

  2. 2

    Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg, Germany

  3. 3

    Departamento de Química Orgánica, Universidad Complutense de Madrid, 28040 Madrid, Spain

  4. 4

    IMDEA-Nanociencia, Facultad de Ciencias, Ciudad Universitaria de Cantoblanco, 28049 Madrid, Spain

*Phone: +49 931 31 83117, Fax: +49 931 31 83109

Publication History

  1. Issue published online: 1 MAR 2011
  2. Article first published online: 10 FEB 2011
  3. Manuscript Accepted: 7 FEB 2011
  4. Manuscript Revised: 4 FEB 2011
  5. Manuscript Received: 14 JAN 2011

Funded by

  • German Research Foundation (DFG) within the SPP 1355 “Elementary processes in organic photovoltaics”. Grant Numbers: DY18/6-1, DY18/6-2
  • MICINN of Spain. Grant Number: project CT2008-00795/BQU
  • R&C program of the Ministry of Science and Education (Spain)
  • Consolider-Ingenio program (Spain). Grant Number: 2010C-07-25200
  • CAM (Spain). Grant Number: project P-PPQ-000225-0505
  • A Ramon y Cajal contract by MICINN of Spain, cofinanced by the EU social funds

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Keywords:

  • electron spin resonance;
  • photoinduced absorption;
  • fullerenes;
  • C70;
  • carbon;
  • organic solar cells

Abstract

Photoinduced polarons in solid films of polymer:fullerene blends were studied by photoluminescence (PL), photoinduced absorption (PIA) and electron spin resonance (ESR). The donor materials used were P3HT and MEH-PPV. As acceptors we employed PC60BM as reference and various soluble C70-derivates: PC70BM, two different diphenylmethano-[70]fullerene oligoether (C70-DPM-OE) and two dimers, C70–C70 and C60–C70. Blend films containing C70 revealed characteristic spectroscopic signatures not seen with C60. Light-induced ESR showed signals at g ≥ 2.005, assigned to an electron localized on the C70 cage. The formation of C70 radical anions also leads to a subgap PIA band at 0.92 eV, hidden in the spectra of C70-based P3HT and MEH-PPV blends, which allows for more exact studies of charge separated states in conjugated polymer:C70 blends. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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