Two-dimensional perovskite templates for durable, efficient formamidinium perovskite solar cells.
Siraj SidhikIsaac MetcalfWenbin LiTim KodalleConnor J DolanMohammad KhaliliJin HouFaiz MandaniAndrew J TormaHao ZhangRabindranath GaraiJessica PersaudAmanda B MarcielItzel Alejandra Muro PuenteG N Manjunatha ReddyAdam BalvanzMuhammad Ashraful AlamClaudine KatanEsther Hsiao Rho TsaiDavid S GingerDavid P FenningMercouri G KanatzidisCarolin M Sutter-FellaJacky EvenAditya D MohitePublished in: Science (New York, N.Y.) (2024)
We present a design strategy for fabricating ultrastable phase-pure films of formamidinium lead iodide (FAPbI 3 ) by lattice templating using specific two-dimensional (2D) perovskites with FA as the cage cation. When a pure FAPbI 3 precursor solution is brought in contact with the 2D perovskite, the black phase forms preferentially at 100°C, much lower than the standard FAPbI 3 annealing temperature of 150°C. X-ray diffraction and optical spectroscopy suggest that the resulting FAPbI 3 film compresses slightly to acquire the (011) interplanar distances of the 2D perovskite seed. The 2D-templated bulk FAPbI 3 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.