Dendritic-based co-adsorbents for dye-sensitized solar cells: Effect of the generations and alkyl chain lengths

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