Semiconductor Materials Modifying And Dye-sensitized Solar Cells Assembling And Testing

Dye sensitization solar cells have emerged since the 1990s as highly effective, simple rocess, long-lasting, and cheap photovoltaic technology. Its research and application will be beneficial to the solution of the energy crisis and environmental pollution. In order to enhance photoelectric conversion to photo-electrode of DSSC, the article uses metallic ion doping under the magnetic field, non-metallic element doping and Metal oxide coating separately to modifing TiO₂. Photovoltaic performances have been studied by assembling the DSSC. The material has been carried on UV-Vis, FTIR, PL, SEM/EDS, XRD, TEM, SEM and XPS.The results revealed that the external magnetic field not only decreased crystalline size of modified TiO₂ and distributed particles uniformity, but also cut down the electron-hole pairs recombination rate, and enhanced the conversion efficiency of the material. The conversion efficiency of DSSC assembled by TiNi_xO_2+x and TiCo_xO_2+x materials were 5.06% and 4.70%, respectively.The co-doped TiO₂ nanoparticles showed high photoactivity under visible light irradiation, which may be ascribed to absorption edge shift to longer wavelength and lower recombination rate of TiO₂. XRD and XPS results also showed that the doped C and N atoms incorporated into the lattice of TiO2 substitute for O atoms. It was found that C, N-co-doped TiO₂ (400 oC) exhibited the highest photocatalytic activity because of the good synergistic effect of co-doped carbon and nitrogen atoms. The conversion efficiency of DSSC got up to 8.39%The doped energy-bands were formed from ZnO coated TiO₂ by the coupling effect of semiconductor material. So electrons and holes captured from doped energy-bands of TiO₂ could be excitated by low-energy photons. Utilization ratio of photons increased, too. The potential barrier could stop electrons excitated from TiO2 transferring into electrolyte. The recombination of lectrons and holes were inhibitted, too. Especially, the photocatalytic activity of TiO₂ significantly was improved, and the conversion efficiency of DSSC got up to 4.67%...