原位设计的三元异质结阵列用于高光电效率染料敏化太阳能电池

Abstract This study introduces a novel, well-aligned ZnIn 2 S 4 @Ti 3 C 2 MXene/TiO 2 hierarchical heterostructure array, fabricated via a multi-step hydrothermal approach, serving as a high-performance photoanode for dye-sensitized solar cells (DSSCs). The results of electron microscopic confirmed the precise formation of this multi-dimensional architecture. The optimized DSSC device attained an impressive power conversion efficiency (PCE) of 8.01 % and a remarkable fill factor (FF) of 73.9 %, representing a significant 28.6 % enhancement over pristine TiO 2 nanowire-based devices. This substantial improvement stems from synergistic mechanisms: The incorporation of ZnIn 2 S 4 (ZIS) facilitates enhanced light harvesting across the visible spectrum. Furthermore, the presence of the conductive MXene mediator orchestrates the formation of dual heterojunctions (TiO 2 /MXene and ZIS/MXene) coupled with Ti 3 C 2 /semiconductor Schottky barriers. This unique configuration establishes an efficient electron transport network, significantly prolonging charge carrier lifetimes and suppressing recombination. Notably, the champion device demonstrated outstanding operational stability, retaining 94 % of its initial PCE after 1000 h of continuous operation. This work pioneers the application of a ZIS/Ti 3 C 2 /TiO 2 ternary system in DSSCs and provides crucial insights for designing heterostructures for advanced photoelectrochemical systems.