The Peparation And Performance Characterization Of Sensitized Solar Cells For TiO₂ Nanorods Light Anode

The wide-band-gap semiconductor TiO₂ has been widely applied into solar cell due to its advantages of high photocatalytic property,large specific surface area,environmental protection,low production cost etc.Because CdS is a narrow band gap semiconductor with a band gap of 2.4 eV,which has the following advantages:narrow band gap,quantum dot structure adjustment,multi-exciton generation effects and so on.In this context,CdS was prepared in quantum dot size.Hydrothermal synthesis has been used to be prepared for TiO₂ nanorods.CdS quantum dots have been prepared by SILAR method.The nanorods have been immersed in N719 for loading dye molecule.Through CdS and dye could absorb visible light respectively,it could generate electron-hole pairs.We have designed TiO₂/CdS and TiO₂/N719 as sensitized photoanodes.From the structure of DSSCs in this paper,it has discussed the preparing of etching,the influence of etching process to the structure of TiO₂ nanorod,and etching based on TiO₂ nanorods of QDSSCs and DSSCs of process preparation and performance.Firstly,TiO₂ nanorods have been prepared by hydrothermal method and have researched the influence of etching time and concentration on the the surface of the nanorods to get the best time and best etching concentration.Secondly,the CdS quantum dots have been prepared on the TiO₂ nanorods,and becoming QDSSC with efficiency of 1.08%.Finally,TiO₂ has been immersed in N719 for 24 h to be a DSSCs.The main conclusions have been as follows;1.TiO₂ nanorods have been prepared on FTO by hydrothermal method.Then,the prepared nanorods are put in hydrothermal autoclave of 25 mL with the film face up,and add a mixed solution of hydrochloric acid and deionized water in it.It is obtained that the optimal time on nanorods is 3 h and the optimal concentration of 7 mL of hydrochloric acid etching with 9 mL of deionized water.2.It is deposited 15 cycles on the etched TiO₂ nanorod with the method of successive ion layer adsorption and reaction.When researched the etching concentration,the optimal efficiency is 1.18%on 3 mL hydrochloric acid.When researched the etching time,the optimal efficiency is 0.78%on 5 h.3.The etched nanorod is immersed in N719,and then constructs in TiO₂/N719 electrode.When researched the different etching concentration,the efficency is 1.6%on 7mL hydrochloric acid.When researched the etching time,the optimal efficiency is 1.0%on 5 h.In order to improve solar cell efficiency,further study is prepared by combining hydrothermal method and etching.Then the prepared nanorod has been immersed in N719 to be electrode.The etched nanorod with hydrothermal again,then etched is the best example,which is 3.6%.The reason is that between the nanorod the distance is bigger after etching.With the second hydrothermal and etching,we obtain two layers of bigger surface etched nanorod.They contribute to absoring dye,and improving the quantity of dye.What is more,it benefit for immersing electrolyte and transmission electronic.