Dye-sensitized solar cells fabricated by using a novel metal-free alkoxysilyl carbazole as a sensitizing dye and a Co(3+/2+)-complex redox electrolyte exhibited light-to-electric energy conversion efficiencies of over 12% with open-circuit photovoltages higher than 1 V by applying a hierarchical multi-capping treatment to the photoanode.

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The co-sensitization of organic silyl-anchor dyes in dye-sensitized solar cells (DSSCs) using carbazole and coumarin dyes with organosilicon tethers for binding to titanium dioxide has been examined. We have succeeded in fabricating a high-performance DSSC with a light-to-electric energy conversion efficiency of 12.8% under one sun simulated solar irradiation.

Photoluminescence properties of Pr-doped alkaline-earth titanates Pr 0.002 (Ca,Sr,Ba) 0.997 TiO 3 are investigated by emission, excitation, and diffuse reflectance spectra at room temperature. The intensities of red luminescence and absorption due to f-f transition of Pr 3+ ions increase in the order of Pr-doped cubic SrTiO 3 , tetragonal BaTiO 3 , and orthorhombic CaTiO 3 . The small red luminescence for Pr-doped SrTiO 3 is increased by substituting Sr by Ca and Ba even if the substituted samples have the same cubic structure as SrTiO 3 and the lattice parameters are close to that of SrTiO 3 . The red luminescence intensity is intense for orthorhombic samples of which the excitation spectra show a peak corresponding to valenceto-conduction band edge and a shoulder referred to as B band. The photoluminescence properties are discussed in relation to the crystal structure.

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