Electron Transport in Nanocrystalline TiO_2 Films Sensitized with [NBu_4]_2[cis-Ru(Hdcbpy)_2(NCS)_2] (N719;[NBu_4]~+=Tetrabutyl Ammonium Cation;H_2dcbpy=4,4'-Dicarboxy-2,2'-bipyridine) and [NBu_4]_2[Ru(Htcterpy)(NCS)_3] (B-dye;H_3tcterpy=4,4',4'-Tric

摘要

We compared electron transport in nanocrystalline TiO_2 films sensitized with [NBu_4]_2[cis-Ru(Hdcbpy)_2(NCS)_2] (N719;[NBu_4]~+=tetrabutylammonium cation;H_2dcbpy=4,4'-di-carboxy-2,2'-bipyridine) and with [NBu_4]_2[Ru(Htcterpy)-(NCS)_3] (B-dye;H_3tcterpy=4,4',4"-tricarboxy-2,2':6',2"-terpyridine).The electron diffusion coefficient (D) and the electron lifetime (r) of the N719-sensitized TiO_2 were comparable to those of B-dye-sensitized TiO_2,although the open circuit pho-tovoltage (V_(oc)) of the solar cells based on N719-sensitized TiO_2 was ca.60 mV larger than that of the solar cells based on B-dye-sensitized TiO_2.We concluded that the energy of the conduction band edge (E_(cb)) of TiO_2 sensitized with N719 was ca.50 mV more negative than that of TiO_2 sensitized with B-dye.