A Study On Preparation Of Anode For Dye-sensitized Solar Cells And Mechanism Of The TiCl₄Post-Treatment

In the past two decades, dye-sensitized solar cells （DSSC） with its high photoelectricconversion efficiency, low cost, simple preparation process, the characteristics of safenon-toxic and caused a large number of attention, and is expected to replace conventionalp-n junction solar cells. The dye molecules capturing sunlight is adsorbed on the surface ofnanostructured titanium dioxide, which transfer photoelectron to the external circuit, so thenanostructured titanium dioxide may determines the batteries in photovoltaic conversionefficiency. Currently, the prepared titanium nanoparticle for anode is not evenly disposed.And the mechanism of TiCl₄treatment is not very clear. This thesis studies the influencefactors in hydrothermal synthesis of nanoparticles, and analysis nanoparticles irregulardistribution phenomenon in the photo-anode by traditional photo-anode synthesis process.According to those work, the thesis put forward optimization approaches that encapsulatingnanoparticle by polyethylene glycol（PEG20,000） before add filler. At last, the impact ofTiCl₄treatment is analyzed by sample’s TEM, XRD, XPS characterization result. The resultsof experiment indicate:1. Preservation temperature and time in the hydrothermal synthesishave a great effect on nanoparticle morphology and crystal form.2. The water solubilitydifference between filler and TiO2is an important incentive of nanoparticle irregulardistribution in the photo-anode. Use encapsulating method can resolve the problem causedby nanoparticle irregular distribution with formula as PEG20,000：TiO2=1:8.3. Theintroduction of TiO2by the TiCl₄treatment is the fundamental reason for efficiency increaseof DSSC（dye sensitized solar cells）, that it can increases degree of nanoparticles order inphoto-anode surface. Then the PEG20,000and titanium organic salt co-coated nanoparticlessurface treatment is expected to simplify the present process.