| With the increasingly serious energy crisis, people pay more attention to solar energy as it is a clean pollution-free and inexhaustible, inexhaustible green energy. Make solar cells is the effective way to use solar energy to convert light energy into electrical energy.Among them, the dye-sensitized cells attracted the domestic and foreign researchers' interests as its advantages of simple preparation and low production cost.Therefore as an important part of dye-sensitized cells,TiO2 thin film electrode has caused extensive concern of researchers.But there are many affected factors during the preparation of TiO2 thin film electrodes, and there is no optimal match among various factors, and the utilization of solar energy is relatively low.Therefore, to solve the above shortcomings, this article mainly reach in the following two aspects.First, in view of many affected factors on processing of preparation TiO2 thin film electrode, including solvents, film former, surfactant and the content of TiO2 in double light anode of each layer, but there is no optimal match among various factors. In this paper, we optimize the optimum process by the orthogonal test between the process of preparation of thin films.Then we use ultraviolet-visible spectra tested the dye adsorption amount of each film, and combined with the I-V curve test system test photoelectric conversion efficiency of each battery. The research results show that we obtained high performance battery through the orthogonal experiment, for photoelectric conversion efficiency is 6.55%, short circuit current density of 24.24 mA/cm2, fill factor of 34.56%.And determines the process conditions of preparation with higher photoelectric conversion efficiency of titanium dioxide film electrode. The result shows that the photoelectric conversion efficiency of DSSC is highest by using isopropyl alcohol as solvent, polyvinylpyrrolidone as film-former, hexadecyl trimethyl ammonium chloride as the surfactant, and preparing bilayer photo-anode film electrode (the quantity of P25 in the bottom is twice as weighty as that of large particles TiO2 in top layer).Secondly, in view of the TiO2 band gap width and can only absorb ultraviolet light for its relatively short wavelengths, for which makes the low efficiency of its effective on using solar energy. In the process of preparation of TiO2, doping Mg, N, F and optimize the optimal process by the orthogonal test. Considering the experimental conditions for three factors doped in TiO2 thin film preparation process is:Adding 1.5% of Mg (NO3)2, according to mole ratio n (F):n (Ti)= 1:50,calcining in the muffle furnace 2h at 500? calcination. Using X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy (UV-Vis) methods to analyzed and characterized the sample. The results show that the absorption of Mg-TiO2 thin film electrode maximum value is 1.833,which is 0.15 higher than TiO2 electrode without doping; In the ultraviolet and visible light range, the optical absorption edge of F-N-TiO2 is bigger than doped TiO2 light absorption edge, the starting position of the absorption edge of F-N-TiO2 electric lights is about 20 nm TiO2 redshift. The thin-film of three factors doped obtains the larges solar photoelectric conversion efficiency. The film which doped the three factors integrated advantages of Mg, N-F doped alone. |
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