Preparation Of Titanium Dioxide Nanorods Thin Films And Solar Cells By Sol-gel And Studies On Photocatalytic Activity

Since the beginning of the 21th century it has been an important way to solve the energy crisis and environment pollution by using solar energy. TiO2 has been extensively investigated in the field of solar cells. But it can not absorb visible light for its wide band—gap,One way to solve this Problem is to use arrow band—gap semiconduetor material to sensitiveit.The nanostructure TiO2 thin films was prepared by sol-gel method,the preparation of metal ion doping TiO2 have been developed. The nanostructure TiO2 films were characterized by XRD, UV-Vis spectra and SEM.Influences of microstructure of TiO2 on the charge recombination and electron transport are introduced and studies on the photoelectronic characteristics and photocatalysis of nano-TiO2 thin films.Firstly, the uniform transparent nanostructure TiO2 thin films is obtained on the glass substrate by sol-gel method, in whice tetrabutyl titanate is used as the precursor, ethanol as the solvent, acetic acid and muriatic acid as the complexant. The results showed that:the films were heated at 500℃for 30min in the air. The thin films was composed of anatase phase and the diameter was 8.14nm,Secondly, Using[Ti(OC4H9)4], CH3COOH, H2O and PEG(1000)as raw materials, nanorods TiO2 thin films were prepared on glass substrate by sol-gel method. the uniform transparent nanostructure TiO2 thin films is obtained on the glass substrate by sol-gel method, in whice tetrabutyl titanate is used as the precursor, ethanol as the solvent, acetic acid and muriatic acid as the complexant. The nanorods TiO2 thin films were characterized by XRD, SEM and UV-VIS spectra. The results showed that the prepared titanium dioxide nanorods is the crystal phase of the anatase-sharpness, In the TiO2 reacting system, after heating the colloidal particles up 1h, the particles coupled together and formed TiO2 nanorods. Its diameter and length is 30-50nm and 100-200nm approximately, respectively. At the same time, after adding 0.30g PEG to the 42ml titanium 'colloidal solution, the visible absorption peak of nanometer TiO2 thin film was increased, and the surface aperture scope of titanium dioxide thin film reach 20-50nm.The results showed that TiO2 film's structure is an anatase phase, The best photocatalysis performance of nanoporous TiO2 thin films were obtained by adding 0.30g PEG in 42mL sol solution. The hole diameters of nanoporous TiO2 thin films range between 20 to 50nm, and the discoloration ratio has increased to 19.90% in 90min. Meanwhile, after the solution were annealled for 1h at 75-80℃, the particle couple linked together form nanometer bars.Thirdly, The dye Rhodamine B is used to sensitize nano-rods Titanium-dioxide (TiO2) thin-films. The crystal phase of Titanium-dioxide nano-rods is the anatase-sharpness. The results indicate that the absorbency of the cell can be improved in visible spectrum by sensitization. The performance of this cell has been greatly improved. In the experiment, cell sensitized by dye Rhodamine B can get a Voc (open circuit voltage) of 520 mV and a I sc (short circuit photocurrent) of 0.435 mA.