Crystal system: monoclinic
| a: | 13.73429966 Å |
| b: | 8.343500137 Å |
| c: | 9.004099846 Å |
| α: | 90° |
| β: | 106.5770035° |
| γ: | 90° |
Starting materials: 1,8-diaminooctane (98%), hydriodic acid (HI, 57% w/w in water and stabilized with 1.5% hypophosphorous acid), lead iodide (PbI2, 99.999%)
Product: block-like crystals
Description: 1 mol 1,8-diaminooctane (98%) was mixed with 2 mol equivalents of HI and was stirred for 2 hours in an ice bath. The resulting salt was recovered by evaporation of the solvent and washing with diethyl ether . PbI2 (2 mol equivalents) was dissolved in 4 mL HI. Diammonium iodide salt (1 mol equivalent) was dissolved in 3 mL HI. The two solutions were mixed and stirred at 90 degrees C for 1 hour and half of the solvent was evaporated. The stirring was stopped and the temperature was gradually decreased (5 degrees C/hour) to −10 °C.
Method: Single crystal X-ray crystallography
Description: Data were collected using a Bruker APEXII diffractometer (MoKα radiation), equipped with a CCD detector.
Starting materials: 1,8-diaminooctane (98%), hydriodic acid (HI, 57% w/w in water and stabilized with 1.5% hypophosphorous acid), lead iodide (PbI2, 99.999%), TiO2
Product: yellow film
Description: 1 mol 1,8-diaminooctane (98%) was mixed with 2 mol equivalents of HI and was stirred for 2 hours in an ice bath. The resulting salt was recovered by evaporation of the solvent and washing with diethyl ether . PbI2 (2 mol equivalents) was dissolved in 4 mL HI. Diammonium iodide salt (1 mol equivalent) was dissolved in 3 mL HI. The two solutions were mixed and stirred at 90 degrees C for 1 hour and half of the solvent was evaporated. The stirring was stopped and the temperature was gradually decreased (5 degrees C/hour) to −10 °C. 1:3.5 ratio of TiO2 Dyesol paste and ethanol (99.5%) produced a ∼250 nm mesoporous film on a microscopic slide. The film was sintered and was used as a substrate. DMF solution of the perovskite crystal was spin-coated and the film was heated at 90 °C for 10 min.
Method: UV-vis absorption
Description: Spectra were recorded using UV-visible Cary 300 spectrophotometer.