Binary Microcrystal Additives Enabled Antisolvent-Free Perovskite Solar Cells with High Efficiency and Stability

摘要

Developing a facile method to prepare high-quality perovskite films withoutusing the antisolvent technique is critical for upscaling production ofperovskite solar cells (PVSCs). However, the as-prepared formamidinium(FA)-based perovskite films often exhibit poor film quality with high densityof defects if antisolvent is not used, limiting the photovoltaic performanceand long-term stability of derived PVSCs. Herein, this work adopts presynthesized3D methylammonium lead chloride (MAPbCl_3) and 1D 2-aminobenzothiazolelead iodide (ABTPbI_3) microcrystals into self-drying perovskiteprecursors, which serve as seed crystals to promote nucleation and growthof FAPbI_3-based perovskites without requiring antisolvent extraction. Thecombined binary microcrystals facilitate the formation of a dense andpinhole-free perovskite film with a stable perovskite lattice and defect-healedgrain boundaries, enabling efficient charge carrier transfer and reduced nonradiativerecombination loss. As a result, the best-performing inverted architecturedevice exhibits a champion power conversion efficiency of 23.27for small-area devices (0.09 cm2) and 21.52 for large-area devices (1.0 cm~2).These values are among the highest efficiencies reported for antisolvent-freePVSCs. Additionally, the unencapsulated device shows enhanced moisture,thermal, and operational stabilities, and maintains 92 of its initial efficiencyafter being held at the maximum power point for 1000 h.