Lead‐Free Tin‐Based Perovskite Solar Cells with over 1600 Hours Stability in N2 Achieved by Multifunctional Additive

Lead‐free tin‐based perovskite solar cells have received great attention due to their promising photovoltaic performance and ecofriendly properties. However, the fast crystallization process and easy oxidation of Sn 2+ limit the device performance. Herein, a multifunctional zinc ethylphenyl dithiocarbamate (Ze) additive is introduced to tune the crystallization process of tin‐based perovskite and suppress the oxidation of Sn 2+ . Meantime, the interaction between Ze and Sn 2+ can effectively passivate defects and reduce nonradiative recombination. As a result, the Ze‐modified solar cells show an efficiency of 4.64% along with excellent long‐term stability.