Photo- and thermal degradation of MDMO-PPV:PCBM blends |
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Authors: | Sylvain Chambon, Agn s Rivaton, Jean-Luc Gardette,Muriel Firon |
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Affiliation: | aLPMM Laboratoire de Photochimie Moléculaire et Macromoléculaire, UMR Université Blaise Pascal/CNRS 6505, 63177 Aubière cedex, France;bCEA INES RDI, DRT/LITEN/DTS/LCS, BP 332, 50 av. du Lac Léman, 73370 Le Bourget du Lac, France |
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Abstract: | This paper is devoted to the study of the photo- and thermal-ageing of MDMO-poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene (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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Keywords: | Conjugated polymers Fullerene Degradation Organic solar cells UV light irradiation |
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