Novel Dopant-Free Carbazole and Phenothiazine-Appended Indolo [3,2-a]carbazole-Based Small Molecules as Efficient Hole-Transport Materials for Perovskite Solar Cell

Developing efficient, stable, cost-effective hole-transport materials (HTMs) is critical for advancing high-performance perovskite solar cells (PSCs). In this work, we introduced novel, dopant-free fused heterocyclic indolo[3,2-a]carbazole (IC)-based HTMs, namely C12Cbz-IC...