Constructing Charge Bridge Path for High‐Performance Tin Perovskite Photovoltaics.

Tin‐based perovskite solar cells (TPSCs) have attracted significant research interest due to their exceptional optoelectronic properties and environmentally friendly characteristics. However, TPSCs with ideal bandgap suffer from substantial current losses, necessitating the development of innovative interface engineering strategies to enhance device performance. In this study, an unprecedented approach constructing charge transfer path is presented by a simple post‐growth treatment of 3‐Aminomethylbenzo[b]thiophene (3‐AMBTh) on the perovskite film. The selective reaction of 3‐AMBTh with exposed FA+ on the perovskite surface suppresses the formation of iodine vacancy defects, leading to a reduction in trap density. Additionally, the residual aromatic rings on the surface form an effective π–π stacking interaction system with subsequently deposited ICBA, facilitating enhanced charge transfer at the interface. By harnessing the potential of the charge transfer path, the TPSCs exhibit remarkable device efficiency of up to 14.53%, positioning them among the top‐performing TPSCs reported to date. [ABSTRACT FROM AUTHOR]