Methanofullerene Elongated Nanostructure Formation for Enhanced Organic Solar Cells

Details Methanofullerene Elongated Nanostructure Formation for Enhanced Organic Solar Cells Methanofullerene Elongated Nanostructure Formation for Enhanced Organic Solar Cells

2007-04-27

arxiv.org/abs/0704.3734v1

Physics

Condensed Matter

Materials Science

14 pages, 3 Figures, In Press Thin Solid Films

Scientific paper

Using transmission electron microscopy (TEM) and Z-contrast imaging we have demonstrated elongated nanostructure formation of fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) within an organic host through annealing. The annealing provides an enhanced mobility of the PCBM molecules and, with good initial dispersion, allows for the formation of exaggerated grain growth within the polymer host. We have assembled these nanostructures within the regioregular conjugated polymer poly(3-hexylthiophene) (P3HT). This PCBM elongated nanostructure formation maybe responsible for the very high efficiencies observed, at very low loadings of PCBM (1:0.6, polymer to PCBM), in annealed photovoltaics. Moreover, our high resolution TEM and electron energy loss spectroscopy studies clearly show that the PCBM crystals remain crystalline and are unaffected by the 200-keV electron beam

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