Department of Chemistry, Lab of Advanced Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Songhu Road 2205, 200438 Shanghai, PR China.
J Am Chem Soc. 2013 Aug 28;135(34):12627-33. doi: 10.1021/ja401827w. Epub 2013 Aug 19.
Imidazolium iodide is an often used component in iodine-based dye-sensitized solar cells (DSSCs), but it cannot operate an efficient DSSC in the absence of iodine due to its low conductivity. For this study, lamellar solid iodide salts of imidazolium or piperidinium with an N-substituted propargyl group have been prepared and applied in solid-state DSSCs. Owing to the high conductivity arising from the lamellar structure, these solid-state ionic conductors can be used as single-component solid electrolytes to operate solid-state DSSCs efficiently without any additives in the electrolyte and post-treatments on the dye-loaded TiO2 films. With a propargyl group attached to the imidazolium ring, the conductivity is enhanced by about 4 × 10(4)-fold as compared to the alkyl-substituted imidazolium iodide. Solid-state DSSC with the 1-propargyl-3-methylimidazolium iodide as the single-component solid-state electrolyte has achieved a light-to-electricity power conversion efficiency of 6.3% under illumination of simulated AM1.5G solar light (100 mW cm(-2)), which also exhibits good long-term stability under continuous 1 sun soaking for 1500 h. This finding paves the way for development of high-conductivity single-component solid electrolytes for use in efficient solid-state DSSCs.
碘化咪唑是碘基染料敏化太阳能电池（DSSC）中常用的组成部分，但由于其导电性低，在没有碘的情况下，它无法有效地运行 DSSC。在这项研究中，制备了具有 N-取代炔丙基基团的咪唑𬭩或哌啶𬭩的层状固态碘化盐，并将其应用于固态 DSSC 中。由于层状结构产生的高导电性，这些固态离子导体可用作单一成分的固态电解质，无需在电解质中添加任何添加剂，也无需对负载染料的 TiO2 薄膜进行后处理，即可有效地运行固态 DSSC。与烷基取代的咪唑𬭩碘化物相比，附着在咪唑环上的炔丙基基团可将电导率提高约 4×10(4)倍。以 1-丙炔基-3-甲基咪唑𬭩碘化物作为单一成分的固态电解质的固态 DSSC 在模拟 AM1.5G 太阳光（100 mW cm(-2))照射下实现了 6.3%的光电功率转换效率，并且在连续 1 个太阳浸泡 1500 小时后也表现出良好的长期稳定性。这一发现为开发用于高效固态 DSSC 的高导电性单一成分固态电解质铺平了道路。
