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Dye-sensitized solar cells is to convert light energy into electrical energy in nature , with a relatively inexpensive, simple fabrication process and the advantages of environmental pollution has attracted national interest in its research scientists . In this thesis, Sol-Gel Preparation of nanometer TiO2 powder , and the powder was synthesized X-ray diffraction analysis . Using a screen printing method and the coating slurry were prepared nanocrystalline TiO2 porous film , and compared slurry coating method through the three different thickness obtained TiO2 film microstructure and battery performance. By Sol-Gel Synthesis of different La3 doping TiO2 nanopowders by XRD analysis of TiO2 Nanoparticles into phase situation ; using slurry spraying La3 successfully prepared by TiO2 doped anode and SEM analysis for the battery and performance testing. XRD analysis showed that , La3 doping control at 0% to 1.0 % range , peaks obtained with the standard TiO2 anatase TiO2 crystal X-ray diffraction peaks are basically the same , TiO2 crystal structure has not changed , La3 may be partially replaced by Ti4, while forming an oxygen vacancy ; also be used as interstitial atoms into the crystal lattice of TiO2 to form a stable solid solution Ti1-3/4xLaxO2 . When La3 doping greater than 1.0%, can be found in rutile diffraction peaks, indicating La3 doping can promote TiO2 from anatase to rutile phase transformation , there exist anatase and rutile mixed crystal phenomena . Calculated according to Scherer , when La3 doping amount control range of 0.5 to 0.9% , TiO2 grain size can be within the 10nm . Also analyzed the mechanism of La3 doping . According La3 doping of 0 %, 0.3 %, 0.5 %, 0.8 % and 1.0% of the IV curve of DSSC , La3 doping amount is 0.5 % or more, the open circuit voltage (Voc) stable at about 0.6V . As La3 doping , a significant short-circuit current increases, while the doping amount of 0.5 % by , Jsc value 5.5mA/cm2, but again with the increase in La3 , Jsc decreases gradually . Wherein , La3 have optimum doping amount , 0.5% , then the open-circuit voltage of the DSSC is 0.608V, the short circuit current was 5.500 mA/cm2, a fill factor of 0.576 , a photoelectric conversion rate of 1.926% .
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