[bmim] Ionic Liquid Electrolyte In The Dsc Applied Research

Dye-sensitized solar cells (DSC) based on sensitized TiO2 nanocrystalline have been investigated intensively because of their low cost, easy fabrication and higher light-to-electricity conversion efficiency. It make sense in research dye-sensitized solar cells not only in the aspect of groping the manufacturing way for low cost and high performance solar cells but also in the aspect of its scientific values in the fields such as semiconductor photoelctronics, nanometer porous material, organic electrolytes and photo-electric chemistry. In this paper, in order to improve the stability and the photoelectric performances, nonvolatile and stable ionic liquid 1-butyl-3-methylimidazolium lodide was used to manufacture ionic liquid and gel electrolytes, and poly(N-butyl-N′-vinyl-imidazole) iodine was used to construct solid-state electrolyte.(1) A novel liquid ionic organic iodide, 1-butyl-3-methylimidazolium lodide ([Bmim]I), was successfully synthesized. The performances of liquid ionic electrolytes containing [Bmim]I, KI and I₂ were discussed. It was found that DSC with the liquid ionic electrolyte has higher photoelectric conversion efficiency of 6.34% under the irradiation of AM1.5 (100 mW·cm^-2); Theσ-T curve accords with Arrhenius equation and the Ea is obtained.(2) Gel polymer electrolytes based on polyvinylpyrrolidone (PVP), [Bmim]I, KI and I2 were prepared. The performances of DSCs containing this kind gel polymer electrolyte were discussed. It was found that the DSC with gel polymer electrolytes (including 0.90 mol·L^-1 [Bmim]I, 0.50 mol·L^-1 KI and 0.12 mol·L^-1 I2 and 35wt.% PVP) have higher photoelectric conversion efficiency of 5.41% under the irradiation of AM1.5.(3) Poly(N-butyl-N′-vinyl-imidazole) iodine was successfully synthesized. A solid-state polymer electrolyte with better photoelectric performance was prepared basing on the poly(N-butyl-N′-vinyl-imidazole) iodine, and the conducting mechanism was discussed by solid-state electrolyte theory. It was found that the conductivity of the poly(N-butyl-N′-vinyl-imida -zole) increased after added I2 and the solid-state polymer electrolyte attained the maximum ionic conductivity of 9.09×10^-5S·cm^-1 when the molar ratio of I– and I₂ is 10:1. The photoelectric conversion efficiency of solid-state polymer electrolyte DSC is 2.64% under irradiation of AM1.5.(4) Compared the stability of DSC based on liquid electrolyte, gel electrolyte and solid-state electrolyte, it was found that the DSC with solid-state electrolyte shows more stable than other electrolytes, the total efficiency attenuates only about 7% after 55 days.