Two-dimensional perovskite templates for durable, efficient formamidinium perovskite solar cells

• Published in: Science (American Association for the Advancement of Science) 2024-06, Vol.384 (6701), p.1227-1235
• Main Authors: Sidhik, Siraj, Metcalf, Isaac, Li, Wenbin, Kodalle, Tim, Dolan, Connor J, Khalili, Mohammad, Hou, Jin, Mandani, Faiz, Torma, Andrew, Zhang, Hao, Garai, Rabindranath, Persaud, Jessica, Marciel, Amanda, Muro Puente, Itzel Alejandra, Reddy, G N Manjunatha, Balvanz, Adam, Alam, Muhammad A, Katan, Claudine, Tsai, Esther, Ginger, David, Fenning, David P, Kanatzidis, Mercouri G, Sutter-Fella, Carolin M, Even, Jacky, Mohite, Aditya D
• Format: Article
• Language: English
• Subjects: Chemical Sciences; Compressive properties; Condensed Matter; Energy conversion efficiency; Iodides; Material chemistry; Maximum power tracking; Perovskites; Photovoltaic cells; Physics; Solar cells; SOLAR ENERGY
• ISSN: 0036-8075; 1095-9203
• DOI: 10.1126/science.abq6993

We present a design strategy for fabricating ultrastable phase-pure films of formamidinium lead iodide (FAPbI ) by lattice templating using specific two-dimensional (2D) perovskites with FA as the cage cation. When a pure FAPbI precursor solution is brought in contact with the 2D perovskite, the black phase forms preferentially at 100°C, much lower than the standard FAPbI annealing temperature of 150°C. X-ray diffraction and optical spectroscopy suggest that the resulting FAPbI film compresses slightly to acquire the (011) interplanar distances of the 2D perovskite seed. The 2D-templated bulk FAPbI 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.