Research reveals enhanced moisture stability and carrier lifetimes in perovskite solar cells with sulfonium passivation, suggesting better long-term reliability.
The long‐term operational stability of perovskite solar cells (PSCs) remains a major hurdle for commercialization, primarily due to bulk defects and ion migration within the perovskite layer. In this work, dimethylphenacylsulfonium tetrafluoroborate (DMPSBF 4 ) as a novel bulk passivating agent for formamidinium lead iodide (FAPbI 3 ) perovskite films is explored. Despite a reduction in film crystallinity upon incorporation of DMPSBF 4 , treated films exhibit enhanced photophysical properties and improved moisture stability. Time‐resolved photoluminescence measurements reveal longer carrier lifetimes, suggesting effective suppression of non‐radiative recombination pathways. Solid‐state nuclear magnetic resonance spectroscopy confirms the formation of chemical interactions between DMPSBF 4 and the perovskite lattice, providing insights into its passivation mechanism. Moreover, stability studies demonstrate that DMPSBF 4 ‐treated films maintain enhanced moisture stability under ambient conditions over extended periods. These findings underscore the potential of sulfonium‐based additives as promising alternatives to conventional ammonium‐based compounds for enhancing bulk passivation and long‐term stability in PSCs.
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Liu et al. (2025) studied this question.
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