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Proceedings Paper

Characterization of potential donor acceptor pairs for polymer solar cells by ESR, optical, and electrochemical investigations
Author(s): Steffi Sensfuss; Maher Al-Ibrahim; Alexander Konkin; Gulnara Nazmutdinova; Uladzimir Zhokhavets; Gerhard Gobsch; Daniel A. M. Egbe; Elisabeth Klemm; Hans-Klaus Roth
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Paper Abstract

In this report new PPV-PPE copolymers DE 69, DE 11 were compared with the state of the art materials MDMO-PPV and poly(3-alkylthiophenes) (P3DDT, P3OT). The optical band gap energy of the two copolymers DE 69, DE11 is somewhat higher than that one of MDMO-PPV. The electrochemical band gap was found to be lower for DE 69, DE11 related to for MDMO-PPV. The absorption coefficient of the new PPV-PPE copolymers is higher than for MDMO-PPV but in the same order of magnitude. Films from composites of MDMO-PPV/PCBM and DE69 or DE11 with PCBM show a clear photoluminescence quenching effect. At 77 K two kinds of LESR signals were identified, one of polarons (P+.) and one of radical anions of fullerenes. The LESR results show strong differences in kinetics between the separation and recombination processes of photoexcited charge carriers. The relaxation rates of paramagnetic centers were estimated by microwave power saturation experiments. Photovoltaic devices were prepared under ambient conditions on flexible PET-ITO foils with MDMO-PPV/ PCBM (1:3 wt. %) with ηAM1.5 = 2.4% and DE 69/ PCBM (1:3 wt. %) with ηAM1.5 = 1.75% (A=0.25 cm2, Pin = 100 mW/cm2).

Paper Details

Date Published: 6 February 2004
PDF: 12 pages
Proc. SPIE 5215, Organic Photovoltaics IV, (6 February 2004);
Show Author Affiliations
Steffi Sensfuss, Thueringisches-Institut fuer Textil- und Kunststoff-Forschung e.V. (Germany)
Maher Al-Ibrahim, Thueringisches-Institut fuer Textil- und Kunststoff-Forschung e.V. (Germany)
Alexander Konkin, Thueringisches-Institut fuer Textil- und Kunststoff-Forschung e.V. (Germany)
Gulnara Nazmutdinova, Thueringisches-Institut fuer Textil- und Kunststoff-Forschung e.V. (Germany)
Uladzimir Zhokhavets, Technische Univ. Ilmenau (Germany)
Gerhard Gobsch, Technische Univ. Ilmenau (Germany)
Daniel A. M. Egbe, Friedrich-Schiller-Univ. Jena (Germany)
Elisabeth Klemm, Friedrich-Schiller-Univ. Jena (Germany)
Hans-Klaus Roth, Thueringisches-Institut fuer Textil- und Kunststoff-Forschung e.V. (Germany)

Published in SPIE Proceedings Vol. 5215:
Organic Photovoltaics IV
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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