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Article Dans Une Revue Solar Energy Materials and Solar Cells Année : 2006

Photo- and thermal degradation of MDMO-PPV:PCBM blends

Résumé

This paper is devoted to the study of the photo- and thermal-ageing of MDMO-poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylene vinylene (PPV) blended with methano-fullerene[6,6]-phenyl C61-butyric acid methyl ester ([60] PCBM), a commonly used active layer of organic solar cells. Thin films of MDMO-PPV, PCBM and MDMO-PPV:PCBM were submitted to photo- and thermal ageing in presence or in absence of oxygen. The modifications of the chemical structure of the materials were analysed by UV-visible and IR spectroscopies. Studying the degradation of pristine materials (MDMO-PPV and PCBM) permit the identification of the markers for characterizing the degradation of each component of the active layer. The degradation of MDMO-PPV was shown to involve a radicalar oxidation implying at first the ethers functions and secondly the double bonds; the photo-oxidation of PCBM was shown to involve the oxidation of its C60 moiety. Photo-oxidation of MDMO-PPV:PCBM blends involved the degradation of both components and the presence of PCBM was observed to largely reduce the rate of degradation of MDMO-PPV in comparison with pristine MDMO-PPV. On a kinetic point of view, the same conclusion was obtained for thermo-oxidation and photolysis (irradiation in absence of oxygen). Our experimental results suggest that the decrease of the rate of degradation of MDMO-PPV in blended films during the three kind of ageing (hυ, T, O2) is mainly related to the radical scavenging properties of the PCBM.
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Dates et versions

hal-00398988 , version 1 (25-06-2009)

Identifiants

  • HAL Id : hal-00398988 , version 1

Citer

Stephanie Chambon, Agnès Rivaton, Jean-Luc Gardette, M. Firon. Photo- and thermal degradation of MDMO-PPV:PCBM blends. Solar Energy Materials and Solar Cells, 2006, 91 (5), pp.394-398. ⟨hal-00398988⟩

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