| Hydrotalcite-like compounds (HTlc), it is a class of layered hydroxide material with special structure and properties which is constituted by two or more metallic elements. HTlc has been widely used in medicine biology, adsorption, catalysis, optoelectronics chemistry and many other fields because of its unique physical and chemical properties. Dye-sensitized solar cells (DSSC) is a potencial research direction in terms of economic, strategic and practicability. Composite oxides semiconductor material can be facilitatly obtained by calcining HTlc and used as basis material for solar cells, which provide a new idea in production of solar cells.Series of Zn/Ti and Zn/Sn HTlc were prepared by urea method and their composite oxides were obtained after calcined at different temperatures. The structure, morphology, energy band, surface properties of HTlc and composite oxides were characterized by XRD, TG-DTA, SEM-EDS, N2 adsorption, UV-vis. DSSC were prepared by assembling using Zn/Ti and Zn/Sn compound oxides as photoanode, N719, N3, D205 as sensitizer, then comprehensive performance of DSSC were studied systematically.(1) Zn/Ti=1～10 of ZnTi HTlc was prepared and calcined at 500℃. The study found that the Zn/Ti= 3-6 of HTlc have better crystallization. With Zn/Ti composite oxide molar ratio increased, TiO2 phase decreased, ZnO phase increased, the specific surface area gradually reduced, the band gap width are between 3.05～3.15eV.(2) Zn/Sn HTlc were successfully prepared, and Zn/Sn composite oxides were obtained by calcining them at different temperature. Effects of urea content, reaction time and molar ratio during synthesis of Zn/Sn HTlc are studied. At 500癈, compound oxides mainly display ZnO diffraction peak,600～900℃ SnO2 diffraction peak becomes strong gradually, then Zn2SnO4 is forming with temperature increasing. Specific surface area of calcined products gradually decreased as the temperature increased. With increase of Zn/Sn molar ratio, the diffraction peaks of ZnO became stronger, UV-vis absorption spectra occurred a little red shift, the band gaps is closed to ZnO.(3) The DSSC were prepared using Zn/Ti composite oxides as photoanode, ruthenium dye N719, N3 and organic dye D205 as sensitizer. Ⅰ-Ⅴ test results showed that the performances of the D205 system DSSC were much excellent than others. Meanwhile, effect of Zn/Ti ratio on the performance of the cell was studied, the efficiency increased first and then decreased. When Zn/Ti=5, the best efficient reached 1.344%.(4) Comprehensive performance of Zn/Sn composite oxides DSSC were studied in N719、N3 and D205 dye systems. The results showed that the efficiency was more higher than others in D205 system. The effects of calcination temperatures and zinc tin molar ratio on composite oxides DSSC performance were also studied. The results showed that the efficiency decreased as the temperature increased, and the highest efficiency was 1.282% at 500℃, The efficiency gradually increased by zinc tin molar increasing, even higher than that single ZnO and SnO2. When Zn/Sn=9, the best efficiency reached 1.796%. |
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