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Complete DMA <sup>+</sup> /Cs <sup>+</sup> Exchange and Rapid Phase Conversion via FAAC-Mediated Intermediate Phase Engineering for Efficient and Stable CsPbI <sub>3</sub> Perovskite Solar Cells
One-line summary
A solar energy research paper on Complete DMA <sup>+</sup> /Cs <sup>+</sup> Exchange and Rapid Phase Conversion via FAAC-Mediated Intermediate Phase Engineering for Efficient and Stable CsPbI <sub>3</sub> Perovskite Solar Cells.
Engineering notes
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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
The crystallization kinetics of all-inorganic perovskites critically influence the photovoltaic performance. Here, we introduce formamidinium acetate (FAAC) as a multifunctional additive to promote the conversion of DMAPbI 3 and Cs 4 PbI 6 intermediates into high-quality black-phase γ-CsPbI 3 thin films. FAAC reduces the formation energy of the Cs 4 PbI 6 intermediate, enabling its early formation during initial heating. Concurrently, FA + cations rapidly intercalate into the DMAPbI 3 lattice, forming a mixed (FA, DMA)Pb(I, AC) 3 phase that facilitates complete cation exchange between DMA + and Cs + and accelerates DMAI removal. This synergistic effect effectively reduces residual DMA + and structural defects. The optimized FAAC-based CsPbI 3 perovskite solar cells (PSCs) achieve a power conversion efficiency (PCE) of 21.84%. Furthermore, the unencapsulated devices exhibit excellent operational stability, retaining 90% of their initial efficiency after 500 h under ambient conditions and 88.7% after 120 h of thermal aging at 85 °C.
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