Self-Assembled Monolayer Hole Transport Layers for High-Performance and Stable Inverted Perovskite Solar Cells

NiOx is regarded as a kind of promising hole transport material in inverted perovskite solar cells (PSCs); however, the uncontrolled defects and unfavorable reactions within the perovskite layer go against device stability and power conversion efficiency (PCE). The pristine NiOx hole transport layer (HTL)-based PSCs usually require additional doping or interface engineering, which tends to introduce additional defects/sharp interfaces and thus affect the device performance. In this study, MeO-2PACz, a type of self-assembled materials (SAMs), was chosen to replace the standard NiOx as HTL and employed in inverted PSCs, since it possesses the potential for manufacturing high-performance stable PSCs. The results demonstrated that MeO-2PACz interacts with uncoordinated Pb2+ in the perovskite film, effectively passivating buried interface defects. Besides, the perovskite…