Stabilizing Buried Interface via Synergistic Effect of Fluorine and Sulfonyl Functional Groups Toward Efficient and Stable Perovskite Solar Cells

Abstract

Highlights An effective buried interface stabilization strategy based on synergistic effect of fluorine and sulfonyl functional groups is proposed. The correlations between molecular structures, defect passivation, interfacial energy band alignment, perovskite crystallization and device performance are established. The device with KFSI achieves an impressive efficiency of 24.17%.

Keywords

• Perovskite solar cells
• Buried interface
• Multiple chemical bonds
• Synergistic effect of functional groups
• Defect passivation