离子液体基聚合物的结构对染料敏化太阳能电池性能的影响研究

设计合成了分别悬挂磺酸官能团、磺酸锂官能团和烷基链官能团的三种结构的离子液体基聚合物,用于聚合物凝胶电解质的制备,并应用于染料敏化太阳能电池中.结果发现这三种聚合物含量的变化对电池性能的影响有较大差别.悬挂普通烷基链官能团的离子液体基聚合物(P-CH₃I)的加入,由于增加了电解质的粘度,使得电池的性能随着P-CH₃I含量的增加而变差;悬挂磺酸锂官能团的离子液体基聚合物P-LiI加入使电池的性能略微下降,而悬挂磺酸官能团的离子液体基聚合物P-HI加入到离子液体电解质后,在一定浓度范围内能改善离子的扩散等性能,从而使基于这种离子液体基聚合物的电池的光电性能相对较好.并通过电解质AFM微观形貌的研究解释了这三类电解质中离子扩散的差异以及光电性能的差别.

Effect of Ionic Liquid Polymers with Different Pendant Group for Polymer Electrolyte on the Photovaltic Performance of Dye-Sensitized Solar Cells

Three ionic liquid polymers with lithium propane sulfonic, methyl and propane sulfonic acid pendant group respectively were used as polymer matrix in polymer electrolyte-based dye-sensitized solar cells (DSSCs). Change in concentration of these three polymers in ionic liquid-based electrolyte was found to have different effects on the photovaltic performance of DSSCs. The cells with P-HI-based electrolytes have shown an increase in the short-current photocurrent (J_sc) with increasing the content of polymer with propanesulfonic acid pendant group. Upon replacing the pendant group propanesulfonic acid with lithium propanesulfonic and methyl, the performance of DSSCs were reduced. The AFM images of electrolytes were employed to investigate the difference of diffusion in these electrolytes.