Crystal system: monoclinic
| a: | 40.685 (±0.004) Å |
| b: | 6.0804 (±0.0006) Å |
| c: | 12.1633 (±0.0012) Å |
| α: | 90° |
| β: | 93.136° |
| γ: | 90° |
Starting materials: Methanol, hexafluorobenzene, (PEA)2SnI4
Product: Red plate-like crystals
Description: Crystals of (PEA)2SnI4 intercalated with hexafluorobenzene were prepared by mixing the base layered perovskite with methanol. Then an excess of hexafluorobenzene was added to the solution and the solution was stirred until it became homogenous and yellow. Then it sat in an inert atmosphere for a few days and red, plate-like crystals of the system formed.
Method: Single-crystal X-ray diffraction
Description: Data was collected with the Bruker SMART CCD diffractometer using 2.4 kW tube X-ray source (Mo Kα radiation).
See all entries for this property (2 total)
Starting materials: Methanol, hexafluorobenzene, (PEA)2SnI4
Product: Thin film on quartz substrate
Description: Films of the intercalated layered perovskites were prepared by immersing the uninteracalated films in a benzene or hexafluorobenzene solution at room temperature for an hour. The films were encapsulated by thin polycarbonate sheet while still wet from their immersion. The encapsulation effectively laminates the hybrid film and provided a partial diffusion barrier for the intercalated species. XRD and optical measurements can be made through the polycarbonate sheet cover.
Method: UV-vis Absorption
Description: Absorption spectra were measured with a Hewlett-Packard UV-vis 8543 spectrophotometer at room temperature on the quartz thin-film samples.
Crystal system: monoclinic
| Absorption peak position, nm |
|---|
Starting materials: Methanol, hexafluorobenzene, (PEA)2SnI4
Product: Thin film on quartz substrate
Description: Films of the intercalated layered perovskites were prepared by immersing the uninteracalated films in a benzene or hexafluorobenzene solution at room temperature for an hour. The films were encapsulated by thin polycarbonate sheet while still wet from their immersion. The encapsulation effectively laminates the hybrid film and provided a partial diffusion barrier for the intercalated species. XRD and optical measurements can be made through the polycarbonate sheet cover.
Method: UV-vis Absorption
Description: Absorption spectra were measured with a Hewlett-Packard UV-vis 8543 spectrophotometer at room temperature on the quartz thin-film samples.
Comment: Exciton peak is noted here. (2.08 eV)
Starting materials: Methanol, hexafluorobenzene, (PEA)2SnI4
Product: Red plate-like crystals
Description: Crystals of (PEA)2SnI4 intercalated with hexafluorobenzene were prepared by mixing the base layered perovskite with methanol. Then an excess of hexafluorobenzene was added to the solution and the solution was stirred until it became homogenous and yellow. Then it sat in an inert atmosphere for a few days and red, plate-like crystals of the system formed.
Method: Thermogravimetric Analysis (TGA)
Description: TGA was performed with a TA Instruments TGA-2950 on the crystals that were isothermally purged in a nitrogen atmosphere at ambient temperature for 20 minutes. The temperature was then increased at a constant rate of 5 degress Celsius per minute up to 600 degrees.
Starting materials: Methanol, hexafluorobenzene, (PEA)2SnI4
Product: Red plate-like crystals
Description: Crystals of (PEA)2SnI4 intercalated with hexafluorobenzene were prepared by mixing the base layered perovskite with methanol. Then an excess of hexafluorobenzene was added to the solution and the solution was stirred until it became homogenous and yellow. Then it sat in an inert atmosphere for a few days and red, plate-like crystals of the system formed.
Method: Differential Scanning Calorimetry (DSC)
Description: DSC was performed with a TA Instruments MDSC-2920. A heating rate of 5 degrees per minute weas used and the temperature scale was calibrated using the indium melting transition. This is power-compensated DSC where the heating rate and power supply is constant.
Starting materials: Tin(II) oxide (Sigma Aldrich, 97%), hydriodic acid (Sigma Aldrich, 57% w/w in H2O, 99.9%), hypophosphorous acid (Avra, 50% w/w H2O), phenylethylamine (Sigma Aldrich, 99.9%), hexafluorobenzene (HFB, Sigma Aldrich, 99%)
Product: (PEA)2SnI4 : HFB crystals
Description: Single crystals of (PEA)2SNI4 were synthesized by adding tin (II) oxide (0.6 mmol), hydriodic acid ( 5 mL), and hypophosphorous acid (3 mL) into a sealed vial and heated at 90 ˚C under constant stirring. After tin (II) oxide dissolved in the solution and yielded a dark yellow color, phenethylamine (1.2 mmol) was injected into the sealed vial by a syringe. A brown sheet of crystals of (PEA)2SNI4 produced after the solution was cooled to room temperature. The crystals were then obtained via filtration. 50 mg of these crystals was dissolved in a mixture of 2 mL methanol and 2 mL HFB. The obtained dark yellow solution was kept open in a glove box. As the solvent evaporates (PEA)2SnI4:HFB crystals precipitate out. The crystals were filtered, dried and stored in a glove box for further use.
Method: Photoluminescence
Description: Recorded on FLS 980 (Edinburgh Instruments).