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[摘要]：A new configuration of a co-sensitized DSSC was proposed, in which different dye molecules are deposited onto the electrodes layer-by-layer, with Au@SiO2 nanoparticles uniformly distributed in the electrodes. Au@SiO2 nanoparticles coupled with dye pairs were proven to have a synergic effect: not only to enhance the light absorption but also accelerate energy transfer from one dye to another, therefore offsetting the inefficiency of bare co-sensitized DSSC which is apt to lose excited photoelectrons because of recombination at the interface between electrode and electrolyte. According to our analysis, the absorption spectra of the dye pair should match with each other to have a positive effect. With a proper pair of dyes (N3 and N719 as an example), we achieved the upmost conversion efficiency with the fabricated co-sensitized solar cell with Au@SiO2 nanoparticles, which is an exception to the current general idea that mono-layered dye molecule-sensitized cells exhibit the greatest efficiency. |
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