Surface Lattice Engineering through Three-Dimensional Lead Iodide Perovskitoid for High-Performance Perovskite Solar Cells
March 11, 2021
Three-dimensional perovskitoid (Me-PDA)Pb2I6 surface layer modification by a simple surface treatment with Me-PDAI2 on top of a 3D perovskite thin film, led to smoother surface texture, longer charge-carrier lifetime, higher charge-carrier mobility, and reduced surface-defect density.
A new bulky-organic-cation-based salt, N-methyl-1,3-propane diammonium diiodide (Me-PDAI2) can template a novel 3D "perovskitoid" structure (Me-PDA)Pb2I6, which exhibits ~28× better out-of-plane transport than the commonly used (PEA)2PbI4 2D structure.
Significance and Impact
Surface treatment Me-PDAI2 atop 3D perovskite forms a thin 3D (Me-PDA)Pb2I6 perovskitoid surface layer with smoother surface texture, longer charge-carrier lifetime, higher charge-carrier mobility, and reduced surface-defect density. Perovskitoid represents a new design motif for perovskite surface engineering.
- Solution processing to prepare 3D perovskitoid based on N-methyl-1,3-propane diammonium (Me-PDA).
- Surface treatment induces the formation of 3D perovskitoid surface layer on top of 3D perovskite thin film.
- Detailed spectroscopic and electrical measurements to understand carrier transport and defect properties.