Highly efficient dye-sensitized solar cells composed of TiO2@SnO2 core-shell microspheres

Hierarchical microspheres constructed from a TiO2 core and a SnO2 shell have been fabricated using a facile solvothermal method. The concentration of precursor Sn4+ in the reaction system plays a key role in the formation of the hierarchical microspheres. These core-shell microspheres of TiO2@SnO2 have been used for the first time as the electrode for C106 dye-sensitized solar cells, exhibiting an efficiency of 6.24%.