Stability issues of conjugated polymer/fullerene solar cells from a chemical viewpoint

Jan C. Hummelen, Joop Knol, Luis Sanchez, Zakya H. Kafafi
2001 Organic Photovoltaics  
The efficiency of energy conversion and the stability or lifetime of 'plastic' photovoltaic cells, based on conjugated polymer/ fullerene blends, are the two main issues to be improved for this type of devices. The stability of these PV cells depends potentially on a large number of factors. A brief layer-by-Iayer overview of these factors is given, with main emphasis on the factors possibly playing a role in the active photovoltaic layer consisting of the interpenetrating network of a
more » ... twork of a conjugated polymer and a fullerene derivative. Complicated sets of photochemical processes can take place in the pure materials and in the donor-acceptor blends, both in the absence and in the presence of oxygen. Especially, photochemical [2+2] cycloaddition and cycloreversion processes have been observed for fullerene derivatives and in certain mixtures containing an oligomer and a fullerene derivative. These and other (photo) chemical processes are very likely to have an influence on the performance of the photovoltaic cell.
doi:10.1117/12.416934 fatcat:s4rc7o6hlfcphlwmqs27igermq