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ITO/TiO2/MEH-PPV/Au solar cells were fabricated using nano-porous titanium dioxide (TiO2) infiltrated with poly(2-methoxy-5-(2'-ethylhexyloxy)-p-phenylene vinylene) (MEH-PPV). The TiO2 films were prepared using poly(ethylene glycol) (PEG) having different molecular weights and spin coated onto indium tin oxide (ITO) coated glass substrates. Transmission electron microscopy (TEM) showed that the dip-coated TiO2 films had uniform thickness of around 70 nm. Surface morphologies of the TiO2 films were investigated using scanning electron microscopy (SEM). It was found that the low molecular weight PEG resulted in small pits in the TiO2 film and increase contact area between TiO2 and MEH-PPV improving the device efficiency of this solar cell.
Date of Conference: 14-17 May 2008