二元离子液体基染料敏化太阳能电池性能的研究

对6种用于染料敏化太阳能电池的二元离子液体电解质进行了考察,电池的光电转化效率在1.39%～4.98%,其中,1-乙基-3-甲基咪唑四氟硼酸盐/碘化1-丁基-3-甲基咪唑类电解质具有最高的光电转化效率。对这种二元离子液体电解质体系进一步优化,测试了不同碘浓度下相应染料敏化太阳能电池的效率、电化学阻抗谱(EIS)和紫外-可见吸收光谱(UV-vis)。结果表明,随着碘单质浓度的增大,铂-电解质界面的传荷电阻(RPt)、TiO2-电解质表面的传荷电阻(Rct)和瓦尔堡阻抗(Zw)逐渐减小,而电解质对紫外光的吸收逐渐增大,在AM1.5的条件下,当碘单质的浓度为0.25 mol/L时电池效率最高,达到5.20%。

Research on the Efficiency of Dye-Sensitized Solar Cell based on binary ionic liquid electrolytes

Six kinds of binary ionic liquid electrolytes were used for DSC and the photoelectric conversion efficiency (PCE) of the device varies from 1.39% to 4.98%. Among these ionic liquids, the electrolyte composed of 1-butyl-3-methylimidazolium iodide (BMII) and 1-ethyl-3-methylimidazolium tetrafluoroborate (EmimBF4) reached the highest efficiency. In order to optimize this binary ionic liquids electrolytes, Electrochemical impendence spectroscopy (EIS), UV-Vis spectroscopy, and photovoltaic performance of DSC based on BMII and EMIMBF4 with the different concentration of iodine were performed. The results showed that the Pt-electrolyte charge-transfer resistance (RPT) , the TiO2-electrolyte charge-transfer resistance (RcT)and Warburg impedance (Zw) decreased with the iodine concentration increasing, however, the absorption intensity of the electrolytes increased. When the concentration of iodine was 0.25 mol/L, the highest PCE of 5.20% was obtained for the DSC based on the binary BMII/EMIMBF4 ionic liquid electrolyte under AM1.5.