Metal–Organic Framework‐Derived N‐Rich Porous Carbon as an Auxiliary Additive of Hole Transport Layers for Highly Efficient and Long‐Term Stable Perovskite Solar Cells

As the standard bidopants of hole transport layers (HTLs) in perovskite solar cells (PSCs), bis(trifluoromethane)sulfonimide lithium salt (Li‐TFSI) and 4‐ tert ‐butylpyridine not only induce adverse influence on the quality of thin films, but also seriously impair the long‐term stability of devices. Herein, a metal–organic framework‐derived 2D graphitic N‐rich porous carbon (NPC) is first introduced into the HTLs as an effective auxiliary...