Journal article

Photoelectron Spectroscopy Studies of Ru(dcbpyH2)2(NCS)2/CuI and Ru(dcbpyH2)2(NCS)2/CuSCN Interfaces for Solar Cell Applications

The electronic structure of the wide band gap hole conductors CuI and CuSCN in contact with an org. dye (Ru(dcbpyH2)2(NCS)2, cis-bis(4,4'-dicarboxy-2,2'-bipyridine)bis(isothiocyanato)ruthenium(II))were studied by photoelectron spectroscopy. The expts. show specific interaction between the NCS groups of the dye mols. and the CuI and CuSCN surfaces. For CuI there are strong indications that the dye mols. interact with CuI through both NCS ligands. Also, one of the carboxylic groups is affected by the surface adsorption on the CuI substrate. For the CuSCN surface about half of the mols. interact with the surface through both NCS ligands, that about half of the mols. interact with the surface through one NCS ligand, and that there is no specific interaction with the carboxylic groups. The measurements also reveal changes in the electronic structure of the dye mol. when adsorbed onto the substrates. In particular, changes in the upper valence electronic structure, important for the function of this material combination in a solar cell device, are discussed.


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