β-Diketone Coordination Strategy for Highly Efficient and Stable Pb–Sn Mixed Perovskite Solar Cells

• DOI: 10.1021/acs.jpclett.1c03555
• Publication Date: 2021-12-02T21:06:51Z
• Authors: Ruyue Wang; Huaizhi Gao; Runnan Yu; Haoran Jia; Zongwen Ma; Zhangwei He; Yuling Zhang; Jing Yang; Lei Zhang; Zhan’ao Tan
• Keywords: SN2 reaction; Glovebox; Diketone; Recrystallization (geology)

The narrow bandgap Pb-Sn hybrid perovskite materials with lower toxicities and adjustable optical bandgaps provide the opportunity to construct high-efficiency solar cells (PerSCs). To solve issues of uncontrollable crystallization rate easy oxidation Sn2+, a β-diketone-based additive, N,N,N',N'-tetraphenylmalondiamide (TPMA), is introduced coordinate Pb2+ Sn2+. introduction TPMA can improve morphology films decrease density defect states, resulting in an enhanced power conversion efficiency >20% improved stability. PerSC without encapsulation retains 94% its initial after being stored for 1000 h nitrogen-filled glovebox shows lifetime only 8% degradation continuously heated 100 at 80 °C. This work represents new strategy introducing β-diketone ligand as additive precursor engineering achieving efficient stable PerSCs.