Tio < Sub > 2 < / Sub > And Batio < Sub > 3 < / Sub > Nanocrystals Of Hydrothermal Synthesis And Research Of Photoelectric Properties

This paper set how to prepare high-quality semiconductor thin films as starting point. The TiO2(anatase) and BaTiO3nanofilms were prepared by hydrothermal method in a strong basic medium. We achieved regulation of the product size and morphology by changing the temperature of hydrothermal reaction and the peptizer concentration. They were applied in DSSCs. The photoelectric properties of the solar cells were discussed. The main contents show as follows:(1) Anatase nanocrystallites were synthesized via hydrothermal reactions following a basic route using tetrabutyl titanate as the source material. The nanocrystallites were used to fabricate nanoporous photoanodes of dye-sensitized solar cells. It was found that the average particle size of TiO2first increased and then decreased with the increasing of hydrothermal temperature. While the photo-electric energy conversion efficiency of the solar cells increased gradually with the temperature, reaching4.05%at220℃. Effect of temperature on crystalline growth dynamics process and photovoltaic conversion performance was discussed.(2) Anatase titanium dioxide particles were prepared by hydrothermal treatment amorphous titania particles peptized with different amounts of tetraethyl ammonium hydroxide(TENOH) at220℃. The influence of the quantity of TENOH on the size and shape of the titanium dioxide particles and the photoelectric properties of the solar cells were mainly investigated. It was found that the average particle size of TiO2first increased and then decreased with the increasing of TENOH, The main morphology was ellipsoidal and gradually formed a small amount of diamond and rectangular. Performance test of the cell indicated that while the quantity of TENOH was1.5ml, the photo-electric energy conversion efficiency of the solar cells was the best, reaching5.16%. The reasons for the different performance parameters were analyzed(3) Using Ba(OH)2·8H2O and P25power as raw materials, BaTiO3and TiO2nano-composite structures were generated by adjustment of Ba/Ti. We discussed the formation mechanism of BaTiO3.BaTiO3nanospheres were synthesized by hydrothermal treatment of nanocrystalline titanium dioxide in the presence of barium hydroxide at Ba/Ti=1,100℃for24h. The DSSCs were fabricated by using BaTiO3and TiO2nanoporous films. The performance of the device was tested. At AM1.5, measured open circuit voltages with nanocrystalline BaTiO3were roughly60mV higher than in solar cells produced using nanocrystalline TiO2(anatase). Photocurrents measured in the BaTiO3cells were roughly1/3those measured with TiO2(anatase) based cell.