Carbazole-Terminated Isomeric Hole-Transporting Materials for Perovskite Solar Cells

摘要： A set of novel hole-transporting materials (HTMs) based on π-extension through the carbazole units were designed and synthesized via a facile synthetic procedure. The impact of isomeric structural linking on their optical, thermal, electrophysical, and photovoltaic properties were thoroughly investigated combining experimental and simulation methods. Ionisation energies of HTMs were measured and are suitable with a triple-cation perovskite active layer ensuring efficient hole injection. New materials were successfully applied in perovskite solar cells (PSCs) and yielded a promising efficiency up to almost 18% under standard 100 mW cm-2 global AM1.5G illumination and show better stability tendency outperforming that of spiro-OMeTAD. This work provides guidance for the molecular design strategy of effective hole conducting materials for perovskite photovoltaics and similar electronic devices.