Bypassing the yellow phase for extremely stable formamidinium lead iodide perovskite solar cells

• 成果类型: Article
• 署名作者: Garai, Rabindranath; Metcalf, Isaac; Nandi, Nilanjana; Ahlawat, Paramvir; Reyes-Suarez, Braulio; Mandani, Faiz; Zhang, Hao; Kodalle, Tim; Irwin, Michael D.; Katan, Claudine; Sutter-Fella, Carolin M.; Kanatzidis, Mercouri G.; Reddy, G. N. Manjunatha; Even, Jacky; Mohite, Aditya D.
• 署名单位: Rice University; University of Cambridge; University of Cambridge; Universite de Lille; Centre National de la Recherche Scientifique (CNRS); CNRS - Institute of Chemistry (INC); United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; Universite de Rennes; Centre National de la Recherche Scientifique (CNRS); CNRS - Institute of Chemistry (INC); Northwestern University; Northwestern University; Universite de Rennes; Centre National de la Recherche Scientifique (CNRS); CNRS - Institute for Engineering & Systems Sciences (INSIS); Rice University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8075; 1095-9203
• DOI: 10.1126/science.aeb7992
• 发表日期: 2026-04-30
• 页码: eaeb7992
• 关键词: halide perovskites; SYM-TRIAZINE; degradation

摘要

Using modeling and structural studies, we show that chloride incorporation in formamidinium lead iodide (FAPI) perovskites alters the energetics of both the formation and degradation pathways. We fabricated films with two coadditives [15 mole % FA chloride (FACl) and 0.5 mole % BA(2)PbI(4), where BA is butylammonium)], in which FACl ensures chloride incorporation and both additives collectively create a compressive lattice strain that stabilizes the FAPI black phase and bypasses the formation of a yellow phase during degradation. The coadditive strategy revealed a favorable transition from face-sharing 2H, 4H, 6H, and 8H phases to the corner-sharing 3C black phase. Photovoltaic devices with a p-i-n architecture had an average power conversion efficiency (40 devices) of 24.1% and lost only 2% of their efficiency after 1200 hours at 85 degrees +/- 5 degrees C, 1-sun illumination, and open-circuit conditions. Upon stressing at 15-sun illumination at 90 degrees C for >400 hours, the stabilized black 3C phase degraded not through the 2H-PbI2 phase but through the energetically uphill 3R-PbI2 phase.