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2 protocols using rubidium iodide

1

Synthesis of Lead-based Perovskite Materials

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PbI2 (99.999%), PbBr2 (99.999%), SnI2 (99.999%), CsI (99.999%), barium iodide (BaI2; 99.995%), rubidium iodide (RbI; 99.9%), BCP, tris(pentafluorophenyl)borane (95%), choline chloride (≥98%), 1,4-diaminobutane (BDA; 99%), methylamine solution [33 weight % (wt %) in absolute ethanol], N,N-dimethylformamide (DMF; anhydrous, 99.8%), dimethyl sulfoxide (DMSO; anhydrous, 99.8%), toluene (anhydrous, 99.8%), isopropyl alcohol (anhydrous, 99.5%), ethyl acetate (anhydrous, 99.8%), and sulfonic acid cation exchange resins (Amberlyst 15, hydrogen form) were purchased from Sigma-Aldrich. [2-(3,6-Dimethoxy-9H-carbazol-9-yl)ethyl] phosphonic acid (MEO-2PACz) (>98%) was purchased from TCI. PEDOT:PSS (Clevios P VP AI 4083) and PEDOT (HTL Solar 3) were purchased from Ossila. Formamidinium iodide (FAI), phenethylammonium bromide (PEABr), and phenethylammonium chloride (PEACl) were purchased from GreatCell Solar. C60 was purchased from Nano-C Inc. Aqueous single-layer graphene oxide (GO) solution with a concentration of 500 mg/liter was purchased from Graphene Supermarket. MAPbCl3 single crystals were synthesized using a previously reported method (55 ). Copper (Cu) pellets and the ITO target were purchased from Kurt J. Lesker Company. Polytetrafluoroethylene (PTFE) and nylon filters were purchased from VWR.
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2

Synthesis of Rb-Cs-FA-PbI3 Perovskite

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For the synthesis of the Rb0.05Cs0.1FA0.85PbI3 perovskite, the following materials were used: lead (II) iodide (Sigma-Aldrich, 99%, St. Louis, MO, USA), formamidinium iodide (FAI) (Sigma-Aldrich, ≥99%, St. Louis, MO, USA), cesium iodide (Sigma-Aldrich, ≥99%, St. Louis, MO, USA), rubidium iodide (Sigma-Aldrich, ≥99%, St. Louis, MO, USA), N,N-dimethylformamide (DMF) (Merck, p.a., Darmstadt, Germany), dimethyl sulfoxide (DMSO) (Merck, p.a., Darmstadt, Germany), chlorobenzene (Merck, p.a., Darmstadt, Germany).
15 × 15 mm indium tin oxide (ITO) coated glass plates (Lumtech, ρ ~15 Ω/sq, CA, USA) were used as substrate and transparent front electrode. For the synthesis of the TiO2 ETL titanium diisopropoxide (Sigma-Aldrich, 99%, St. Louis, MO, USA), acetylacetonate (Sigma-Aldrich, 99%, St. Louis, MO, USA) and ethanol (Merck, p.a., Darmstadt, Germany) were used. For the preparation of the spiro-OMeTAD HTL, spiro-OMeTAD (Merck, ≥99%, Darmstadt, Germany), 4-tert-butylpyridine (tBP) (Sigma-Aldrich, 99%, St. Louis, MO, USA), FK209 (Sigma-Aldrich, 99%, St. Louis, MO, USA), bis-(trifluoromethane)sulfonimide lithium salt (LiTFSI) (Sigma-Aldrich, 99%, St. Louis, MO, USA) and acetonitrile (Merck, p.a., Darmstadt, Germany) were used.
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