Synthesis of low melting hole conductor systems based on triarylamines and application in dye sensitized solar cells

Dye sensitized hybrid solar cells with a nanoporous TiO2 layer and different organic hole transport materials (HTM) have been investigated. As HTMs, some novel triphenyldiamine (TDP) based polymers carrying long alkoxyl group as side chains or in the backbone were designed and synthesized using Ullmann reaction. The thermal and electrochemical properties are studied. The soft spacers lower the T, of the polymers suitably. The penetration behavior of the HTM into the namnoporous layer in solar cells has been studied by scanning electron microscopy (SEM). The thermal treatment for getting higher penetration of HTM into nanoporous layer did not work, perhaps due to the decomposition of the dye.