Dithiafulvalene-Based Hole Transport Materials Enabling Efficient and Stable n‑i‑p Perovskite Solar Cells via a Robust Doping‑Oxidation Mechanism.
The stability of conventional hole transport materials (HTMs, e.g., Spiro‑OMeTAD) in n‑i‑p perovskite solar cells (PSCs) remains a critical challenge, particularly due to the unstable nitrogen‑centered radical cations ([Ar3N]·+) generated during their p‑type doping oxidation. Herein, three indenofluorene (IF)-based HTM...