Electrolyte materials are the key components in dye-sensitized solar cells (DSCs) and are very crucial to the performance and long-term stability of DSCs. We developed a series of diamide derivatives as novel low molecular mass organogelators (LMOGs) for DSCs. These LMOGs contain different numbers (2, 6, 5 and 9) of methylene groups (–CH2–) between the two amide carbonyl groups and exhibit distinctive self-assembly behaviors. The gel electrolytes prepared by these LMOGs possess high gel-to-solution transition temperatures (over 100 °C) and the stability of DSCs is largely enhanced. More importantly, the parity of the number of –CH2– and their special molecular arrangements have a remarkable influence on the self-assembly of the gelators resulting in a significantly different morphology, and further influence the photovoltaic performances of DSCs. It is found that the LMOGs containing odd-numbered –CH2– lead to a much better charge transport of the gel electrolytes, inducing a longer electron lifetime and higher incident photon-to-electron conversion efficiency compared with the LMOGs containing even-numbered –CH2–. Finally, a superior quasi-solid-state DSC based on the gelator containing five –CH2– is obtained, which exhibits a photoelectric conversion efficiency of 7.53% and excellent thermal and light-soaking stabilities during accelerated aging tests.
电解质材料是
染料敏化太阳能电池(
DSC)的关键部件,对于
DSC的性能和长期稳定性至关重要。我们开发了一系列二酰胺衍
生物作为
DSC 的新型低分子量有机凝胶剂 (LMOG)。这些LMOG在两个酰胺羰基之间含有不同数量(2、6、5和9)的亚甲基(-
CH2-),并表现出独特的自组装行为。这些LMOG制备的凝胶电解质具有较高的凝胶到溶液的转变温度(超过100℃),并且
DSC的稳定性大大增强。更重要的是,- -数量的奇偶性及其特殊的分子排列对凝胶剂的自组装产生显着影响,导致显着不同的形貌,并进一步影响
DSC的光伏性能。研究发现,与含有偶数 - 的 LMOG 相比,含有奇数 - - 的 LMOG 可以实现更好的凝胶电解质电荷传输,从而具有更长的电子寿命和更高的入射光子到电子转换效率–.最终,获得了基于含有五个- -的胶凝剂的优质准固态
DSC,其光电转换效率为7.53%,在加速老化测试中表现出优异的热稳定性和光浸泡稳定性。