Presynthesized 3D methylammonium lead chloride (MAPbCl3) and 1D 2-aminobenzothiazole lead iodide (ABTPbI3) microcrystals as self-drying perovskite precursors and used them as seeds to promote FAPbI3-based calcium Nucleation and growth of titanite, thereby eliminating the need for anti-solvent extraction. The combined binary crystallites facilitate the formation of dense and pinhole-free perovskite films with a stable perovskite lattice and defect-healing grain boundaries for efficient charge carrier transfer and reduced Radiative recombination loss.
The best-performing inverted structure device exhibited a power conversion efficiency of 23.27% for a small-area device (0.09cm2), and 21.52% for a large-area device (1.0cm2). These values are among the highest efficiencies reported for solvent-free PVSC. Furthermore, the unencapsulated device showed enhanced humidity, thermal, and operational stability, and maintained 92% of its initial efficiency after 1000 h at the maximum power point.
Wang Deng et.al Binary Microcrystal Additives Enabled Antisolvent-Free Perovskite Solar Cells with High Efficiency and Stability Adv. Energy Mater. 2022
DOI: 10.1002/aenm.202203649