Research Of Quasi-Solid Electrolyte In DSSC

Dye-sensitized solar cells(DSSCs),due to the low cost and easy fabrication,have attracted extensive attention in the world and is considered a landmark in the research of solar cell ,ever since it firstly came into being. Electrolytes play an important part in DSSC.Quasi-solid electrolyte have many advantages that both not exsist in liquid and solid electrolytes.The presence of liquid electrolyte may result in some practical limitations of sealing and long-term operation.Solid electrolyte can't cantact well with conterelectrode and has low light-energy efficiency.This dissertation mainly studied the gel of electrolytes,prepared quasi-solid electrolytes.and the electrochemical properties were tested via several methods.First electrolytes were made by agar as gel, KI,I2 as solute and Acetonitrile,glycol as solvent,every element was analyzed and optimized ,then a gel electrolyte is of high ionic conductivity 6.58 mS.cm-1.when assemblyed into DSSC, the light-energy efficiency is 1.21%.When PAA is agar,every element also studied. ionic conductivity was abtained via EIS while the apprarent diffusion coefficients of I3- wasstudied by steady I-E curve..the variations of their ionic conductivy with temperatures was also studied.the best ionic conductivity it had obtained is 4.68 mS.cm-1 and the diffusion coefficients of I3- is 4.97×10-6 .PEO is not able to be the agar by itself, PEO of different molecular weight together can gelation electrolyte.but the ionic conductivity is only 5.78×10-4S.cm-1. And p(VDF-HFP) only dissolve in some special solvents. It can dissolve in liquid electrolyte of V乙酸乙酯:V乙二醇is 8.6:1.4.gel-electrolyte of 1.32 m S.cm-1 was made.