See all entries for this property (2 total)
Crystal system: orthorhombic
| a: | 8.3343 (±0.0003) Å |
| b: | 8.2225 (±0.0004) Å |
| c: | 27.6171 (±0.0015) Å |
| α: | 90° |
| β: | 90° |
| γ: | 90° |
Starting materials: n-butylamine, PbBr2, HBr
Product: plate-like colorless crystals
Description: 0.34 mmol PbBr2, 0.7 mmol n-butylamine are mixed in 3 mL of 9M HBr. The mixture is then heated to 100 ˚C for 2 h to dissolve the solid, and then slowly cooled down to room temperature at −2 °C·hr−1.
Method: Single crystal X-ray diffraction
Description: Frames were collected using Bruker D8 Venture diffractometer equipped with a Photon 100 CMOS detector employing Mo Kα radiation (λ=0.71073 Å).
Starting materials: BABr (synthesized), PbBr2, HBr
Product: Colorless single crystals
Description: (BA)2PbBr4 crystals were synthesized by mixing BABr, and PbBr2 into a saturated HBr solution at a molar ratio of 2:1. Complete dissolution was achieved by heating to boiling with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 1°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), PbBr2, HBr
Product: Colorless single crystals
Description: (BA)2PbBr4 crystals were synthesized by mixing BABr, and PbBr2 into a saturated HBr solution at a molar ratio of 2:1. Complete dissolution was achieved by heating to boiling with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 1°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), PbBr2, HBr
Product: Colorless single crystals
Description: (BA)2PbBr4 crystals were synthesized by mixing BABr, and PbBr2 into a saturated HBr solution at a molar ratio of 2:1. Complete dissolution was achieved by heating to boiling with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 1°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 (synthesized), PbBr2, HBr
Product: Colorless single crystals
Description: (BA)2PbBr4 crystals were synthesized by mixing BABr, and PbBr2 into a saturated HBr solution at a molar ratio of 2:1. Complete dissolution was achieved by heating to boiling with constant stirring for ~30 minutes. Upon slowly cooling, at a rate of 1°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: unknown
| Band gap (fundamental), eV |
|---|
Starting materials: BABr salt, PbBr2 salt, stoichiometric ratio 2:1
Product: spin-coated thin film, high crystallinity
Description: Starting materials dissolved in 4:1 DMF:DMSO solvent mixture, stirred for 30 min at room temperature. Substrate: Quartz substrate with 120 nm gold layer with interdigitated fingers. Precursor solution (0.05-0.1 molar) pipetted onto substrate and spin-coated, 4000 rpm / 30 seconds, targeting film thicknesses 80-300 nm.
Method: Electroabsorption
Description: Films were spin-coated onto interdigitated Au electrode array - 45 micron distance between opposing fingers. Samples mounted in cryostat with Cu wires soldered to opposing electrode stripes. Xe lamp light spectrally filtered, focused on sample and subsequently on UV-enhanced Si photodiode detector. Sample transmission, substrate transmission, and sample electrotransmission were collected in independent scans.Absorbance and electroabsorbance were then calculated from the respective transmissions. The fundamental gap is determined by the crossover point of absorption curves measured under different electric fields in the fundamental band gap region.
Comment: Significantly more detail in paper.
Crystal system: unknown
| Exciton binding energy, eV |
|---|
Starting materials: BABr salt, PbBr2 salt, stoichiometric ratio 2:1
Product: spin-coated thin film, high crystallinity
Description: Starting materials dissolved in 4:1 DMF:DMSO solvent mixture, stirred for 30 min at room temperature. Substrate: Quartz substrate with 120 nm gold layer with interdigitated fingers. Precursor solution (0.05-0.1 molar) pipetted onto substrate and spin-coated, 4000 rpm / 30 seconds, targeting film thicknesses 80-300 nm.
Method: Electroabsorption
Description: Films were spin-coated onto interdigitated Au electrode array - 45 micron distance between opposing fingers. Samples mounted in cryostat with Cu wires soldered to opposing electrode stripes. Xe lamp light spectrally filtered, focused on sample and subsequently on UV-enhanced Si photodiode detector. Sample transmission, substrate transmission, and sample electrotransmission were collected in independent scans.Absorbance and electroabsorbance were then calculated from the respective transmissions. The exciton binding energy arises as the difference of the 1s exciton peak energy observed in conventional absorption and the fundamental gap as determined by the crossover point of absorption curves measured under different electric fields in the fundamental band gap region.
Comment: Significantly more detail in paper.
Crystal system: unknown
| Exciton energy, eV |
|---|
Starting materials: BABr salt, PbBr2 salt, stoichiometric ratio 2:1
Product: spin-coated thin film, high crystallinity
Description: Starting materials dissolved in 4:1 DMF:DMSO solvent mixture, stirred for 30 min at room temperature. Substrate: Quartz substrate with 120 nm gold layer with interdigitated fingers. Precursor solution (0.05-0.1 molar) pipetted onto substrate and spin-coated, 4000 rpm / 30 seconds, targeting film thicknesses 80-300 nm.
Method: Electroabsorption
Description: Films were spin-coated onto interdigitated Au electrode array - 45 micron distance between opposing fingers. Samples mounted in cryostat with Cu wires soldered to opposing electrode stripes. Xe lamp light spectrally filtered, focused on sample and subsequently on UV-enhanced Si photodiode detector. Sample transmission, substrate transmission, and sample electrotransmission were collected in independent scans. Absorbance and electroabsorbance were then calculated from the respective transmissions.
Comment: Significantly more detail in paper.