Photovoltaic effect in blend systems and heterostructures of poly(p-phenylenevinylene) and C-60

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 tra nsfer from the semiconducting polymer (PPV) to an electron acceptor (C-60) We have built heterostructures of PPV and sublimed C-60 On the one hand and blend systems of PPV with a methanole soluble C-60 On the other hand. For this purpose a dendrimer with a C-60 core has been synthesized to make the fullerene soluble in the precursor PPV. The photovoltaic properties are inv estigated in these blends and heterojunction devices sandwiched between ITO and Al.