Interface Chelation Induced by Pyridine‐Based Polymer for Efficient and Durable Air‐Processed Perovskite Solar Cells
Kuiyuan Zhang, Yaxin Deng, Xiangrong Shi, Xin Li, Dianpeng Qi, Bo Jiang, Yudong Huang
Abstract
Abstract Polymer doping is a significant approach to precisely control nucleation and crystal growth of perovskites and enhance electronic quality in perovskite solar cells (PSC) prepared in air. Here, a brand‐new self‐healing polysiloxane (SHP) with dynamic 2,6‐pyridinedicarboxamide (PDCA) coordination units and plenty of hydrogen bonds was designed and incorporated into perovskite films. PDCA units, showing strong intermolecular Pb 2+ ‐N amido , I − ‐N pyridyl , and Pb 2+ ‐O amido coordination interactions, were expected to enhance crystallinity and passivate the grain boundary. In addition, abundant hydrogen bonds in SHP afforded the self‐healing of cracks at grain boundaries for fatigue PSCs. Significantly, the doped device demonstrated a champion efficiency of 19.50 % with inconspicuous hysteresis, almost rivaling those achieved in control atmosphere. This strategy of heterocyclic‐based macromolecular doping in PSCs will pave a way for realizing efficient and durable crystalline semiconductors.