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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.

Scientific Achievement

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.

Research Details

• 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.

DOI: 10.1016/j.chempr.2020.12.023