Photovoltaic effect in blend systems and heterostructures of poly(p-phenylenevinylene) and c60

The photovoltaic effect in Poly(p-phenylenevinylene) (PPV) can be increased by an effective charge separation. In order to suppress the recombination of photogenerated charge carriers, it is useful to support the electron transfer from the semiconducting polymer (PPV) to an electron acceptor (C60). We have built heterostructures of PPV and sublimed C60 on the one hand and blend systems of PPV with a methanole soluble C60 on the other hand. For this purpose a dendrimer with a C60 core has been synthesized to make the fullerene soluble in the precursor PPV. The photovoltaic properties are investigated in these blends and heterojunction devices sandwiched between ITO and A1.