See all entries for this property (11 total)
Crystal system: triclinic
| a: | 11.615 (±0.0004) Å |
| b: | 11.6275 (±0.0005) Å |
| c: | 17.5751 (±0.0006) Å |
| α: | 99.547 (±0.001)° |
| β: | 105.724 (±0.001)° |
| γ: | 89.977 (±0.001)° |
Starting materials: Not stated.
Product: Crystals
Description: Grown at room temperature from a solution in N,Ndimethylformamide (DMF) using nitromethane as the poor solvent.
Method: X-ray diffraction
Description: Rigaku R-AXIS RAPID diffractometer with Mo Ka radiation. Refer to the first page of the paper for details.
See all entries for this property (2 total)
Starting materials: (PEA)2PbBr4 crystals, DMF, glass substrates
Product: Thin film on glass
Description: Dissolve the 2D single crystals into DMF at a concentration 6%∼10% relative to the total weight. Spin-coat at 3000 rpm for 30 s on glass substrates. Anneal in air at 100 °C for 10 min before measurement.
Method: UV-Vis absorption
Description: Optical absorption spectra were obtained using a Shimadzu UV-3600 spectrophotometer.
Crystal system: triclinic
| Photoluminescence peak position, nm |
|---|
Starting materials: (PEA)2PbBr4 crystals, DMF, glass substrates
Product: Thin film on glass
Description: Dissolve the 2D single crystals into DMF at a concentration 6%∼10% relative to the total weight. Spin-coat at 3000 rpm for 30 s on glass substrates. Anneal in air at 100 °C for 10 min before measurement.
Method: Photoluminescence
Description: The photoluminescence spectra were measured using a Horiba-Jobi-Yvon LabRAM ARAMIS system, with a 325 nm He-Cd laser excitation. The laser beam was collimated and focused through a 40X UV objective onto the sample surface at room temperature. Refer to figure 5.
See all entries for this property (2 total)
Starting materials: (PEA)2PbBr4 crystals, DMF, glass substrates
Product: Thin film on glass
Description: Dissolve the 2D single crystals into DMF at a concentration 6%∼10% relative to the total weight. Spin-coat at 3000 rpm for 30 s on glass substrates. Anneal in air at 100 °C for 10 min before measurement.
Method: Photoluminescence
Description: The photoluminescence spectra were measured using a Horiba-Jobi-Yvon LabRAM ARAMIS system, with a 325 nm He-Cd laser excitation. The laser beam was collimated and focused through a 40X UV objective onto the sample surface at room temperature. Refer to figure 5.
Crystal system: unknown
| Band gap (fundamental), eV |
|---|
Starting materials: PEABr 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: PEABr 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: PEABr 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.