Two-dimensional perovskite templates for durable, efficient formamidinium perovskite solar cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 38870286.
- Also identified by DOI 10.1126/science.abq6993.
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Abstract
We present a design strategy for fabricating ultrastable phase-pure films of formamidinium lead iodide (FAPbI<sub>3</sub>) by lattice templating using specific two-dimensional (2D) perovskites with FA as the cage cation. When a pure FAPbI<sub>3</sub> precursor solution is brought in contact with the 2D perovskite, the black phase forms preferentially at 100°C, much lower than the standard FAPbI<sub>3</sub> annealing temperature of 150°C. X-ray diffraction and optical spectroscopy suggest that the resulting FAPbI<sub>3</sub> film compresses slightly to acquire the (011) interplanar distances of the 2D perovskite seed. The 2D-templated bulk FAPbI<sub>3</sub> films exhibited an efficiency of 24.1% in a p-i-n architecture with 0.5-square centimeter active area and an exceptional durability, retaining 97% of their initial efficiency after 1000 hours under 85°C and maximum power point tracking.