Research In Performance Of Dye-sensitized Solar Cells Based On Tin Compounds Nano Composites

Dye-sensitized solar cell is considered to be new type of the most promisingphotovoltaic cell for its low cost, simple preparation, friendly to environment andhigh photoelectric conversion efficiency. Until now, to develop and optimize newphoto-anode materials is still an important research direction. Binary semiconductorSnO2and ternary alkaline earth metal stannates have shown excellent performance indye-sensitized solar cell as photo-anode materials. But there are still many problemsand shortcomings in their application. Therefore, the study on performance ofdye-sensitized solar cells based on tin compounds nano-composites is very important.In this paper, three groups of tin compounds nano-composites are synthesizedvia hydrothermal-calcination and hydrothermal-precipitation-calcination methods byusing simple reactants. And they are used as novel type of photo-anode materials indye-sensitized solar cells. The synergy of nano-composites improves dye adsorptioncapacity of such materials based films, and reduces the the film s’ charge transportimpedance. Ultimately, good photoelectric performances of dye-sensitized solarcells based on these composites are obtained.(1) SnO2&BaSnO3nano-composite is prepared via hydrothermal-calcinationmethod by using active SnO2·xH2O and Ba(OH)2as reactants. SnO2&BaSnO3nano-composite combines advantages of the two components. The existence ofSnO2improves charge transfer performance of the photo-anode films; the generationof BaSnO3significantly improves film’s dye adsorption capacity. Dye-sensitizedsolar cell based on this nano-composite exhibits a photoelectric conversionefficiency of2.51%with open-circuit voltage of0.62V and short-circuit currentdensity of6.06mA·cm-2.(2) SnO2&SrSnO3nano-composite is prepared via hydrothermal-calcinationmethod by using active SnO2·xH2O and Sr(OH)2as reactants. SnO2&SrSnO3nano-composite combines advantages of the two components. The existence ofSnO2improves charge mobility of the photo-anode films; the generation of SrSnO3 significantly improves films’ dye adsorption capacity. Dye-sensitized solar cellbased on this nano-composite exhibits a photoelectric conversion efficiency of2.40%with open-circuit voltage of0.59V and short-circuit current density of7.37mA·cm-2.(3) SnO2&SrSnO3nano-composite is prepared via hydrothermal-precipitation-calcination method by using NaSnO3and SrCl2as reactants. SnO2&SrSnO3nano-composite combines the advantages of the two components. The existence ofSnO2improves films’ charge mobility and extends the lifetime of the photo-excitedelectrons; the generation of SrSnO3significantly improves dye adsorption capacity.Dye-sensitized solar cell based on this nano-composite exhibits a photoelectricconversion efficiency of2.48%with open-circuit voltage of0.58V and short-circuitcurrent density of6.97mA·cm-2.