Rubidium bromide

Chemicals including lead
bromide (PbBr₂, ≥98%), formamidinium bromide (FABr,
≥98%), rubidium bromide (RbBr, 99.6%), potassium bromide (KBr,
≥99%), oleic acid (technical grade, 90%), oleylamine (technical
grade, 70%), dimethylformamide (DMF, 99.8%), chloroform (≥99%),
toluene (99.8%), hexane (≥95%), and acetonitrile (99.8%) were
purchased from Sigma-Aldrich. All of the chemicals were directly used
as received without further purification.

Caesium bromide (CsBr, 99.999%), lead bromide (PbBr₂, 99.999%), lead chloride (PbCl₂, 99.999%) was purchased from Alfa Aesar. Formamidinium bromide (FABr) and phenethylammonium bromide (PEABr) were purchased from Greatcell Solar. Rubidium bromide (RbBr, 99.99%), polyvinylpyridine (PVP, average Mw ~55,000), 4,7,10-trioxa-1,13-tridecanediamin (TTDDA), poly(9-vinylcarbazole) (PVK, average Mn 25,000–50,000) were purchased from Sigma Aldrich. The NiO_x nano-crystals were purchased from Avantama AG and were used without additional treatment. 1,3,5-tris(1-phenyl-1H-benzimidazol-2-yl)benzene (TPBi) was purchased from Luminescence Technology corp. Other materials for device fabrication were all purchased from Sigma-Aldrich.

Cesium bromide (CsBr, 99.999%), rubidium bromide (RbBr, 99.6%), lead bromide (PbBr₂, 99.999%), lead chloride (PbCl₂, 99.999%), lead iodide (PbI₂, 99.999%), molybdenum trioxide (MoO₃, ≥99.5%), 1,3,5-tris(bromomethyl)−2,4,6-triethylbenzene (TBTB, 97%), chlorobenzene (C₆H₅Cl, 99.8%) and dimethyl sulfoxide (DMSO, ≥99.9%) were purchased from Sigma Aldrich. 1,1-Bis[(di-4-tolylamino)phenyl]cyclohexane (TAPC, >99.5%) and 1,4,5,8,9,11-Hexaazatriphenylenehexacarbonitrile (HAT-CN, >99%) were purchased from Ossila. All materials were used as received without further purification.