Modification And Performance Of Photoanode Materials For Dye-sensitized Solar Cells

The non-metallic elements N, rare earth elements La, Ce, Sm doped nanocrystalsTiO2particles, respectively, as well as co-doped TiO2particles with Sm and N, wereprepared in the paper. And the application of doped TiO2particles in dye-sensitizedsolar cells photo-anodes was also investigated. In the experiments, nitrogen-dopedTiO2nanoparticals were prepared by the traditional wet and rare earth ions dopedTiO2nanoparticles were prepared by hydrothermal synthesis, respectively. Thephoto-electrochemical properties of batteries assembled with these samples werestudied by a series of analytical methods. Meanwhile, the reaction conditions anddoped process were optimized. The main contents are discussed as following:1) Nitrogen-doped TiO2nanoparticles was prepared by wet. The effect of stirringtime and the added amount of ammonia on DSSCs were discussed, respectively. Theoptimized conditions: the mixing time was1.5h, the added amount of ammonia was50ml, the urea was introduced as a second nitrogen-dopant under this condition. Atlast, the photoelectric conversion efficiency was7.58%with0.5g urea.2) The rare earth ion doped TiO2nanoparticles were prepared by hydrothermal.The optimal amount of rare earth ion nitrates was discussed. La3+/TiO2, Ce3+/TiO2,Sm3+/TiO2particles were prepared by La (NO3)3, Ce (NO3)3, Sm (NO3)3, respectively.The photo-anodes were sensitized by N719, porphyrin, respectively. The effect ofdown-conversion luminescence of rare earth ions on DSSC were further proved by theperspective of the photocurrent density changed.3) Sm-N/TiO2particle was prepared by hydrothermal method. Compared withN/TiO2and Sm/TiO2samples, the photoelectric performance of DSSC assembled withSm-N/TiO2sample did not get much significant improvement. To some extent, themechanism of N and Sm-doped DSSC were similar, which improve the absorption ofvisible light to enhance the photoelectric conversion efficiency. So there is no synergybetween them.