| Since1991professor Gratzel firstly reported the Dye-sensitized solar cell (DSSC) which had solar-to-electricity conversion efficiency of7.1-7.9%, it has pointed to new train of thought for the development of DSSC owing to its simple structure, low cost, and easy fabrication. Researchers have summarized the working principle of DSSC into two direction’s reaction. They are forward reactions including dye excitation, electron injection, electron transfer, and dye regeneration; back reactions including excited dye decay to ground state, recombination of the injected electron in TiO2to the oxidize dye, and recombination of the injected electrons in TiO2or FTO to I3-. Under this working principle, Jsc is the result of the dynamic competition between the forward and back reactions. One of the two key limitations for enhancing forward reaction is slow transport rate, it is because there are a lot of charger traps including grain boundaries, amorphous layers, surface defects and so on in the classical nanoparticle film. In order to solve this problem researchers made the anode into one dimension structure, the experiment results have proved the transpote rate in array film is two orders of magnitude higher than nanoparticle film. But its surface area is much lower than nanoparticle film; it has low dye absorption so as to low photocarriers. So it can not improvement the efficiency of DSSC efficiently.This paper starts with the thought that fast electron transport rate at the same time not reduce day absorption, synthesis silver core coated by titanium shell structure that is Ag-TiO2nanocables by one-step hydrothermal method, which introduce a single metal core which has a faster electron transport ability into a single traditional titanium nanowire. According the structure of reinforcing steel bar and concrete principle, keep the nanocables stand straight by P25in the photoanode, which made a part of nanocable stand in photoanode in the form of array. At last made it into solar cell and the photocarriers can be transported into out circuit by the silver core. The major content and major research result were listed in the following.(1) Synthesis Ag core and TiO2shell nanocables by tetrabutyl titanate (TBT). ethylene glycol (EG), and AgNO3. Research the influence to the product morphology of different reagent adding order. At last make sure the most suitable reaction situation and make the Ag-TiO2nanocables with the lengths of3-8μm and diameters of100-150nm. The end of the silver core is bear and the titanium shell is amorphous.(2) Produce photoanode by P25. Take some P25. Though a series process including diluting, stirring, ultrasounding and concentrating, at last made it into titanium sizing agent then made the photoanode by doctor balding method. After be calcined at high temperature, we get the film with microcrack and orderly surface.(3) Using Ag/TiO2nanocables in the photoanode of DSSC. Doctor balding photoanode which containing Ag/TiO2nanocables and P25. and research the I-V results of DSSC made by different Ag/TiO2nanocables contention, then make sure the absorbed dye and EIS of the sample, at last we get the conclusion that silver core make the electron transport rate fast. |
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