Electrode Modification Technology Based On Improved Efficiency Of Solar Cells

Dye-sensitized solar cell(DSSC) is a device that can convert luminous energy to electric energy. It has much significatance to protect environment, because of abundant raw material that nonhazardous and unpoisonous and recoverability, low-cost, simple industrial technology and a large advantage in industrial production. A DSSC is composed of photoanode, dye sensitzers, redox eletrolytes and counter electrode. At present, the most common catalyst is Pt counter electrodes, which can reduction I3- into I- effectively, as an usual counter electrode in DSSC. For good counter electrode materials, should not only have high power conversion efficiency and high stability, and at the same time must be cheap. In our work focus on developing to prepare a nono-rods structure of W18O49-rGO compound, which exhibit a good catalytic activity while graphene has got a well conductivity. We studied that the weight ratio of composite materials, the effects of the experimental parameters, and the relationship between the photoelectric conversion performance and the catalytic performance. The main contents of this paper are as follows:1) W18O49-rGO were synthesized via the solvothermal utilizing WCl6 in ethanol at 180℃ for 24 h. Through regulating the different ratio of WCl6 and GO in composite material source and studying the relative content of its composite catalytic performance of the electrode based on electrode DSSC photoelectric conversion efficiency. In particular, when the percentage of W18O49 is 35%, the PCE of 7.2% was achieved, which was much higher than those DSSCs. The formation of W18O49-rGO was confirmed electrochemical characterization methods. The results show that W18O49-rGO nanostructure is more efficient for the I3- reduction and a good catalytic activity.2) Under the condition of NH3, the composie of W18O49-rGO could transform into the composite of WN-rGO, applying for DSSC. The formation of WN-rGO was confirmed electrochemical characterization methods. Under the same condition, based on the above compsite counter electrodes was 7.4%, which was much higher than those DSSCs. The high catalytic activity and the power conversion efficiency(PCE) close to the Pt electrode, to a certain extent can be alternative to Pt.