Crystal system: orthorhombic
| a: | 50.869 (±0.002) Å |
| b: | 8.1993 (±0.0004) Å |
| c: | 8.0822 (±0.0004) Å |
| α: | 90° |
| β: | 90° |
| γ: | 90° |
Starting materials: BABr (synthesized), CsBr, PbBr2, HBr
Product: Yellow single crystals
Description: (BA)2Cs2Pb3Br10 crystals were synthesized by mixing BABr, CsBr, and PbBr2 into a saturated HBr solution at a molar ratio of 3.5:2:3. Complete dissolution was achieved by heating to 100°C with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 20°C/min to room temperature, the crystals precipitated. The crystals were removed by suction filtration and were dried in a vacuum.
Method: Single-crystal X-ray diffraction
Description: A synchrotron radiation source ( λ = 0.7749 Å) in a nitrogen atmosphere was used for the SCXRD data. The crystals were mounted on a Bruker diffractometer with a Kapton tip. Nitrogen cryogen with a temperature controller precisely adjusted the temperature during measurement. APEX 3 software was used for data reduction and SADABS software was used for multiscan absorption correction. Structure calculations were performed using the SHELXTL program.
Starting materials: BABr (synthesized), CsBr, PbBr2, HBr
Product: Yellow single crystals
Description: (BA)2Cs2Pb3Br10 crystals were synthesized by mixing BABr, CsBr, and PbBr2 into a saturated HBr solution at a molar ratio of 3.5:2:3. Complete dissolution was achieved by heating to 100°C with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 20°C/min to room temperature, the crystals precipitated. The crystals were removed by suction filtration and were dried in a vacuum.
Method: UV-vis absorption
Description: A Shimadzu UV-3101 UV-vis spectrophotometer was used to measure the absorption spectra.
Crystal system: orthorhombic
| Band gap (optical, transmission), eV |
|---|
Starting materials: BABr (synthesized), CsBr, PbBr2, HBr
Product: Yellow single crystals
Description: (BA)2Cs2Pb3Br10 crystals were synthesized by mixing BABr, CsBr, and PbBr2 into a saturated HBr solution at a molar ratio of 3.5:2:3. Complete dissolution was achieved by heating to 100°C with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 20°C/min to room temperature, the crystals precipitated. The crystals were removed by suction filtration and were dried in a vacuum.
Method: UV-vis absorption
Description: A Shimadzu UV-3101 UV-vis spectrophotometer was used to measure the absorption spectra.
Starting materials: BABr (synthesized), CsBr, PbBr2, HBr
Product: Yellow single crystals
Description: (BA)2Cs2Pb3Br10 crystals were synthesized by mixing BABr, CsBr, and PbBr2 into a saturated HBr solution at a molar ratio of 3.5:2:3. Complete dissolution was achieved by heating to 100°C with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 20°C/min to room temperature, the crystals precipitated. The crystals were removed by suction filtration and were dried in a vacuum.
Method: Photoluminescence microscopy
Description: PL spectra were recorded in a PL microscope. A Janish Research Company ST-500 microscope cryostat using a Coherent OBIS 375LX laser was used for the measurements.
Crystal system: orthorhombic
| Photoluminescence peak position, nm |
|---|
Starting materials: BABr, CsBr, PbBr2, HBr
Product: Yellow single crystals
Description: (BA)2Csn-1PbBr3n+1 crystals were synthesized by mixing BABr, CsBr, and PbBr2 into a saturated HBr solution in an appropriate stoichiometry. Complete dissolution was achieved by heating to boiling with constant stirring for ~30 minutes. Upon slowly cooling to room temperature colorless (n = 1) and yellow (n = 2 and 3) precipitated in their respective solutions. The crystals were removed by suctio9n filtration and were dried in a vacuum. Pure-phase single crystals were obtained via the following BA:Cs:Pb ratios: n = 1, 2:0:1; n = 2, 3:1:2, n = 3, 3.5:2:3.
Method: Photoluminescence Spectra
Description: A Janish Research Company ST-500 microscope cryostat using a Coherent OBIS 375LX laser was used to measure low-temperature PL. An excitation wavelength of 375 nm was used. PL spectra at high temperature was performed in the same system with a HCP422G gas-tight hot plate.