Solar energy paper index
Solvent Esterification and Stoichiometric Control in Ambient-Grown FAPbI <sub>3</sub> Single-Crystal Solar Cells
One-line summary
A solar energy research paper on Solvent Esterification and Stoichiometric Control in Ambient-Grown FAPbI <sub>3</sub> Single-Crystal Solar Cells.
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Chinese explanation / 中文解读
中文解读待补充：本站会优先为光伏效率、钙钛矿太阳能电池、储能技术、太阳能热利用、BIPV、并网技术等高价值论文补充中文说明。
Original abstract
Inverse temperature crystallization (ITC) is widely used to grow high-quality perovskite single crystals, yet prolonged thermal exposure during this process can introduce chemical instabilities that hinder controlled crystal growth. In this work, we uncover unexpected solvent-dependent redissolution of formamidinium lead iodide (FAPbI 3 ) during ITC. While a mixed γ-butyrolactone (GBL) and 2-methoxyethanol (2ME) solvent system beneficially enables α-FAPbI 3 growth in ambient conditions, we discover that FAPbI 3 facilitates an esterification reaction of the two solvents that modifies the coordination environment and destabilizes perovskite during extended heating. Lead iodide (PbI 2 ) deficiency effectively delays the redissolution process, resulting in reduced δ-FAPbI 3 formation and stabilized growth of thin α-FAPbI 3 single crystals. Single-crystal solar cells based on phase-pure α-FAPbI 3 crystals achieve 22.99% power conversion efficiency, setting a record for such devices fabricated under ambient air conditions. These results reveal an overlooked solvent-precursor interaction during ITC and demonstrate stoichiometry control as a practical strategy for stabilizing α-FAPbI 3 single crystals for high-performance photovoltaic applications.
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