Study On Modified Nano TiO₂ And Sulfur-based Electrolyte For Sensitized Solar Cells

As a new effective way of using solar energy, the dye-sensitized solar cells (DSC) have attracted considerable attention around the world, because of its simple preparation procedure, low cost, friendly environment action, high photoelectric conversion efficiency and better stability. Thus the DSC have good prospect in the research of solar cells.The nanoporous TiO2 and ZrO2/TiO2 films are prepared by high-pressure hydrothermal method, an organic dye TH305 and a near IR dye HY103 were used as sensitizer dyes, and a double-band tandem organic dye-sensitized solar cell was producted. We studied the photoelectric characteristics by details, obtained a conversion efficiency of 11.5%. At the same time, we used electrochemical impedence spectra to investigate the energy band in the composite electrodes. Based on the difference in the bleaching width of the TiO2 and ZrO2/TiO2 composite electrodes, the flat potential in the composite electrode was about-0.62V by fitting the curve through Mott-Schottky equation.The nanoporous TiO2 and MgO/TiO2 films are prepared by high-pressure hydrothermal method, TH305 was used as the sensitizer dye, the photoelectrochemical properties of the sensitized composite electrodes were studied. When the mol ratio of the MgO/TiO2 was 1:99, the photoelectrochemical properties of the composite electrode were optimal which showed prominent efficiency,8.21%. Under similar test conditions, the reference dye N719 showed 7.91% efficiency. At the same time, we used electrochemical impedence spectra to investigate the energy band in the composite electrodes. Based on the difference in the bleaching width of the MgO and MgO/TiO2 composite electrode, the flat potential in the composite electrode was about-0.54V by fitting the curve through Mott-Schottky equation.A sulfur-based electrolyte redox couple, (CH3)4N)2S/((CH3)4N)2Sn, was employed in CdS quantum dots (QDs) sensitized solar cells, and an unprecedented energy conversion efficiency of up to 3.2% was obtained with a very high fill factor (ff0.89) has been observed under AM 1.5 G illumination. The QDs were linked to nanoporous TiO2 via covalent bond by using thioglycolic acid (TGA), followed by chemical bath deposition (CBD) in an organic solvent to prepare the QDs-cells, facilitating high wettability and superior penetration capability of the TiO2 films. We studied the redox potentials of the sulfur-based electrolyte by using electrochemical method, and gave the theoretical explanation of the results from the high Voc and ff.A CoS electrode was prepared by chemical bath method, TH305 was used as the sensitizer dye, ((CH3)4N)2S/((CH3)4N)2Sn, as an organic electrolyte, the photoelectrochemical properties of the sensitized composite electrode were studied by electrochemical impedance spectra, and an energy conversion efficiency of up to 5.24% has been attained, under AM 1.5 G illumination.