Bis trifluoromethane sulfonimide lithium salt li tfsi

Formamidinium iodide (CH(NH₂)₂, FAI) was purchased from Dyesol. Lead (II) iodide (PbI₂; 99.9985%) and bis(trifluoromethane)sulfonimide lithium salt (Li-TFSI) were purchased from Alfa Aesar. 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamino)−9,9′-spirobifluorene (spiro-OMeTAD; ≥99.5%) was purchased from Lumtec. Cesium carbonate (Cs₂CO₃; 99.9%), oleylamine (OAm; technical grade, 70%), oleic acid (OA; technical grade, 90%), 1-octadecene (ODE; technical grade, 90%), octane (anhydrous, ≥99%), hexane (reagent grade, ≥95%), methyl acetate (MeOAc; anhydrous, 99.5%), lead nitrate (Pb(NO₃)₂; 99.999%), ethyl acetate (EtOAc; anhydrous, 99.8%), formamidinium acetate (FA-acetate, 99%), titanium ethoxide (≥97%), hydrochloric acid (HCl; 37% in water), chlorobenzene (anhydrous, 99.8%), 4-tert-butylpyridine (4-TBP; 96%), toluene (anhydrous, 99.8%), dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and acetonitrile (anhydrous, 99.8%) were purchased from Sigma-Aldrich and used as received unless otherwise specified.

Cesium carbonate (Cs₂CO₃; 99.9%), oleic acid (OA; technical grade, 90%), 1-octadecene (1-ODE;
technical grade, 90%), oleylamine (OLA; technical grade, 70%), methyl
acetate (MeOAc; anhydrous, 99.5%), hexanes (reagent grade, ≥95%),
octane (anhydrous, ≥99%), formamidinium acetate (FA-acetate;
99%), toluene (anhydrous, 99.8%), titanium diisopropoxide bis(acetylacetonate)
(TAA; 75 wt % in isopropanol), 1-butanol (anhydrous, 99.8%), acetone
(for HPLC, ≥99.9%), chlorobenzene (anhydrous, 99.8%), 4-tert-butylpyridine (tBP; 98%), and acetonitrile
(anhydrous, 99.8%) were purchased from Sigma-Aldrich. Bis(trifluoromethane)sulfonimide
lithium salt (Li-TFSI; 98+%) and lead iodide (PbI₂, 99.9985%)
were purchased from Alfa Aesar. Isopropanol (IPA; ACS Plus) was purchased
from Fisher Chemical. Spiro-OMeTAD was purchased from Lumtec.

Lead (II) iodide (PbI₂; 99.99%) and lead (II) bromide (PbBr₂; >98.0%) were purchased from TCI America. Formamidinium iodide (FAI;) and methylammonium bromide (MABr;) were purchased from GreatCell Solar Materials. Bis(trifluoromethane)sulfonimide lithium salt (Li-TFSI) was purchased from Alfa Aesar. Cesium iodide (CsI; 99.999%) and 4-tert-butylpyridine (tBP; 96%) was purchased from Sigma-Aldrich. 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamino)-9,9′-spirobifluorene (spiro-OMeTAD; ≥99.5%) was purchased from Lumtec, SnO₂ colloidal dispersion was obtained from Alfa Aesar and diluted to 1.5% in DI water before use. Poly(triaryl amine) (PTAA; 5–20 kDa) was obtained from Solaris Chem, and poly(9,9-bis(3’-(N,N-dimethyl)-N-ethylammoinium-propyl-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene))dibromide (PFN-Br) was purchased from 1-Material. All the solvents (dimethylformamide (DMF), dimethylsulfoxide (DMSO), chlorobenzene (CB), toluene, methanol) were obtained from Sigma-Aldrich.