Series of dendritic building blocks (G series) with various periphery alkyl chain lengths (C3, C10 and C18) were prepared via convergent synthesis route through reaction-selective building block, (4-Isocyanato-4′(3,3-dimethyl-2,4-dioxo-azetidino)diphenylmethane, IDD) and diethylenetriamine (DETA) via alternative addition and ring-opening reaction. These azetidine-2,4-dione containing dendritic building blocks then reacted with several amino acid compounds to generate the corresponding dendritic co-adsorbents (GA series). GA series comprising different generations, various alkyl chain lengths closed to anchor and/or in the periphery are discussed and applied into dye-sensitized solar cells (DSSCs). The cells utilized similar phenothiazine-based dyes (HL5) as sensitizer with fixed concentration (0.3 mM) of co-adsorbents are fabricated to explore the effect on cell performances and interfacial charge properties. Power conversion efficiencies (PCEs) of 7.02–7.76% were achieved, which better than the commercially available CDCA co-adsorbent based cell (6.71% ± 0.14%). In addition, the highest conversion efficiency also reaches 95% of the standard cell based on N719 metal dye. Herein, several observations: (1) under various alkyl chain lengths closed to anchor, the longest one has efficient charge recombination; (2) under various alkyl chain lengths in the periphery, the moderate one has the best interfacial properties with the longest electron lifetime value; (3) under different generations, the largest one can reduce dye aggregation and charge recombination significantly. Based on our pervious initial study on dendritic co-adsorbents, we further investigated several molecular design on dendritic co-adsorbents to realize the structural effect on cell performance that might be useful for DSSC applications.

通过收敛合成路线，通过反应选择性结构单元（4-Isocyanato-4'（3,3-dimethyldimethyl-2），通过收敛合成路线制备了一系列具有不同外围烷基链长度（C3，C10和C18）的树枝状结构单元（G系列） ，4-二氧-氮杂叠氮基）二苯基甲烷（IDD）和二亚乙基三胺（DETA）通过交替加成和开环反应。然后将这些含氮杂环丁烷2,4-二酮的树枝状结构单元与几种氨基酸化合物反应生成相应的树枝状共吸附剂（GA系列）。讨论了GA系列，该系列包括不同的世代，锚定和/或外围封闭的各种烷基链长度，并将其应用于染料敏化太阳能电池（DSSC）。这些细胞利用了类似的基于吩噻嗪的染料（HL5）用作固定浓度（0.3 mM）的增敏剂，以研究其对电池性能和界面电荷性质的影响。功率转换效率（PCE）为7.02-7.76％，优于市售的基于CDCA共吸附剂的电池（6.71％±0.14％）。此外，最高的转换效率也达到了基于N719金属染料的标准电池的95％。在此，有以下几点观察：（1）在各种烷基链长度接近锚定的情况下，最长的一个具有有效的电荷重组；（2）在外围的烷基链长度不同的情况下，中等的具有最佳的界面性质和最长的电子寿命值；（3）在不同的世代中，最大的世代可以显着减少染料的聚集和电荷重组。