| Solar cells are a device that converts light energy into electrical energy,which is one of the effective ways to solve the gradual depletion of fossil energy and environmental pollution.As a new third-generation solar cell,dye-sensitized solar cells have been a hot spot in today’s research because of their simple structure,low cost,environmental friendliness and simple preparation process.Compared with traditional dye-sensitized solar cells,flexible dye-sensitized solar cells convert the original glass conductive substrate into a flexible conductive substrate,which has more convenient use conditions and a wider range of applications,but the photoelectric conversion efficiency is lower.Photoanode is the key to improve the photoelectric conversion efficiency of dye-sensitized solar cells,and Ti O2nanoparticles have high chemical stability,non-toxic and environmental protection are commonly used as photoanodes.Flexible dye-sensitized solar cell conductive substrates are generally divided into metal and polymer materials,in recent years,researchers have studied the preparation of nanoporous Ti O2films on polymer conductive substrates,such as sol-gel method,electrophoretic deposition method and magnetron sputtering method.However,these methods currently have the problem of poor adhesion between Ti O2grains and flexible polymer substrates.The metal flexible conductive substrate can avoid the above problems because it can be calcined at high temperature.Therefore,we uses flexible titanium foil as a conductive substrate,uses anodic oxidation to generate regular Ti O2nanotube arrays on titanium foils,and uses different methods to compound Zn O on Ti O2nanotube arrays to improve the photoelectric conversion efficiency of batteries,the main work is as follows:（1）Anatase type Ti O2nanotube array was prepared on flexible titanium foil by secondary anodic oxidation method.Optimized the timing of the oxidation reaction,the electrolyte concentration,and some details of anodizing product treatment.The optimal growth time of the Ti O2nanotube array was determined to be 2h for both anodizing,and the electrolyte was ethylene glycol+2vol%deionized water+0.5wt%NH4F.Zn O nanorods were compounded on Ti O2nanotube arrays by water bath and continuous water bath,and the results showed that the crystal phase orientation obtained by Ti O2/Zn O composite photoanodes prepared by continuous water bath was more consistent,and the battery composed of flexible graphite counterelectrodes had better photoelectric performance.The open-circuit voltage,short-circuit current density,filling factor and photoelectric conversion efficiency of the obtained battery were 0.41 V,0.19 m A/cm2,0.27 and 2.15%,respectively.（2）On the basis of the preparation of Ti O2nanotube array by secondary anodic oxidation,Ti O2/Zn O composite photoanode was prepared by low-temperature electrochemical deposition.The same electrochemical deposition potential was controlled,and electrochemical deposition was carried out in 30min,60min,90min,120min and 150min respectively to find out the growth time corresponding to the best photoelectric performance.The results show that the photoelectric performance is the best when the electrochemical deposition time is 90min.The open-circuit voltage,short-circuit current density,fill factor and photoelectric conversion efficiency of the obtained battery were 0.63 V,0.32 m A/cm2,0.27 and 5.45%,respectively.（3）Using the low-temperature electrochemical deposition method,on the basis of the above,the electrochemical deposition time is controlled for 90min,and the electrochemical deposition is carried out under the deposition potential of-0.8V,-1.0V and-1.2V respectively to find out the best photoelectric performance corresponding to the deposition potential.The results show that when the electrochemical deposition potential is-1.0V,the photoelectric performance is the best. |
