4.5 Article

Binding energy of singlet excitons and charge transfer complexes in MDMO-PPV: PCBM solar cells

Journal

PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 5, Issue 10-11, Pages 364-366

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201105430

Keywords

excitons; charge transfer complexes; photoluminescence; organic solar cells; MDMO-PPV; PCBM

Funding

  1. Bundesministerium fur Bildung und Forschung [03SF0356B]
  2. Deutsche Forschungsgemeinschaft [SPP1355, DE 830/8-1]
  3. Bavarian Academy of Sciences and Humanities
  4. Bavarian Ministry of Economic Affairs, Infrastructure, Transport and Technology

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The influence of an external electric field on the photoluminescence intensity of singlet excitons and charge transfer complexes is investigated for a poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylenevinylene] (MDMO-PPV) diode and a bulk heterojunction of the PPV in combination with [6,6]-phenyl-C-61 butyric acid methylester (PCBM), respectively. The experimental data is related to the dissociation probability derived from the Onsager-Braun model. In this way, a lower limit for the singlet exciton binding energy of MDMO-PPV is determined as (327 +/- 30) meV, whereas a significantly lower value of (203 +/- 18) meV is extracted for the charge transfer complex in a MDMO-PPV: PCBM blend. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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