Starting materials: Lead(II) oxide (Sigma Aldrich, 99.9%), decylamine (Sigma Aldrich, 99%), hydriodic acid (Sigma Aldrich, 57% w/w in H2O, 99.9%)
Product: (DA)2PbI4 crystals
Description: (DA)2PbI4 single crystals were synthesized by dissolving lead oxide (0.5 mmol) in 20 mL of hydriodic acid by heating to boiling under constant stirring. To it, 0.5 mmol of decylamine was added. The solution was heated and stirred until the precipitate dissolved completely. Then the solution was allowed to cool naturally to room temperature.
Method: UV-visible absorption
Description: UV-Visible absorbance data were recorded on the transmission mode in Cary Series UV-Vis Spectrophotometer (Agilent Technologies).
Starting materials: HI, DA (C12H25NH3), Et2O, PbI2
Product: Thin film of (C12H25NH3)2PbI4
Description: Prepare dodecylammonium iodide salts via neutralization of HI with DA. Remove unreacted species by evaporation. Purify product by recrystallization in minimal diethyl ether/excess hexane and isolate via vacuum filtration. Prepare films by spin-coating or drop-casting solutions (prepared by dissolving DAI and PbI2 powders at a 2.5:1 molar ratio in a 1:0.34 volume ratio mixture of THF and methanol). Spin-coat films from solutions of 20 mg/mL at 2000 rpm for 30 s and anneal for 15 min at 70 °C.
Method: UV-Vis absorption
Description: Steady-state room-temperature absorption spectra were determined by placing spin-coated films on glass in a using an HP 8453 spectrometer.