N,N′-dimethylformamide (DMF; 99.8%), dimethyl sulfoxide (DMSO; 99.9%), hydrobromic acid [HBr; 48 weight % (wt %) in water], BAB (99%), and polyethylenimine (80% ethoxylated solution and 37 wt % in H2O) were purchased from Sigma-Aldrich. PbI2 (99.99%; trace metals basis) was purchased from Tokyo Chemical Industry (TCI). TFB (99.8%) and FAI (≥99.5%) were purchased from Xi’an p-OLED company. Zinc acetate dihydrate (99.99%) and tetramethylammonium hydroxide pentahydrate (TMAH; 97%) were purchased from Aladdin Reagents. All other organic solvents were purchased from Aladdin Reagents. All chemicals were used directly without any further purification, unless otherwise stated.

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