P3HT/PCBM/SWNTs photovoltaic devices

It is shown that the introduction of functionalized single-walled carbon nanotubes SWNTs in bulk heterojunction polymer-fullerene photovoltaic devices results in an improvement of both the short circuit current density and the fill factor. An optimum performance with a power conversion efficiency of 1.4% is obtained with 0.5 wt% of SWNTs in a (1:1) P3HT/PCBM mixture. The results indicate that the addition of nanotubes enhances the performance of polymerfullerene photovoltaic cells by means of both the electron accepting feature of fullerenes and the high electron transport capability of SWNTs.

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