See all entries for this property (2 total)
Crystal system: monoclinic
| Band gap (optical, diffuse reflectance), eV |
|---|
Starting materials: Lead(II) oxide (PbO, <10 μm, ReagentPlus®, ≥99.9% trace metals basis ), HI (57 wt. % in H2O), pentylamine 99%, H3PO2 (50 wt. % in H2O)
Product: orange plate-like crystals
Description: PbO powder (2232 mg, 10 mmol) was dissolved in 57% w/w aqueous HI solution (16 mL) in a 50 mL glass flask by heating to boiling under stirring. A bright yellow solution resulted. 1159 μL (10 mmol) of pentylamine in 50% aqueous H3PO2 (2 mL) was slowly added. The solution was slowly cooled to room temperature.
Method: UV-vis absorption (diffused reflectance)
Description: Optical diffuse-reflectance measurements were conducted at room temperature. A Shimadzu UV-2600 PC double-beam, double-monochromator spectrophotometer was operating from 200 to 2500 nm. BaS4 was used as a non-absorbing reflectance reference. Reflectance v. wavelength data was collected and used to estimate the band gap by converting reflectance to absorbance via the Kubelka-Munk equation: α/S = (1-R)^{2}/2R. Band gap energy was calculated based on the absorption edge and exciton peak of the optical absorption spectra.
Crystal system: monoclinic
| Photoluminescence peak position, eV |
|---|
Starting materials: Lead(II) oxide (PbO, <10 μm, ReagentPlus®, ≥99.9% trace metals basis ), HI (57 wt. % in H2O), pentylamine 99%, H3PO2 (50 wt. % in H2O)
Product: orange plate-like crystals
Description: PbO powder (2232 mg, 10 mmol) was dissolved in 57% w/w aqueous HI solution (16 mL) in a 50 mL glass flask by heating to boiling under stirring. A bright yellow solution resulted. 1159 μL (10 mmol) of pentylamine in 50% aqueous H3PO2 (2 mL) was slowly added. The solution was slowly cooled to room temperature.
Method: Photoluminescence microscopy
Description: Data was collected with a Horiba LabRam Evolution high-resolution confocal Raman microscope spectrometer (600g/mm diffraction grating, with a diode continuous wave laser (473 nm, 25 mW) and a Synapse charge-coupled device camera. PL energy was calculated by the PL peak position of the optical emission spectra.
Starting materials: Lead(II) oxide (PbO, <10 μm, ReagentPlus®, ≥99.9% trace metals basis ), HI (57 wt. % in H2O), pentylamine 99%, H3PO2 (50 wt. % in H2O)
Product: orange plate-like crystals
Description: PbO powder (2232 mg, 10 mmol) was dissolved in 57% w/w aqueous HI solution (16 mL) in a 50 mL glass flask by heating to boiling under stirring. A bright yellow solution resulted. 1159 μL (10 mmol) of pentylamine in 50% aqueous H3PO2 (2 mL) was slowly added. The solution was slowly cooled to room temperature.
Method: Photoluminescence microscopy
Description: Data was collected with a Horiba LabRam Evolution high-resolution confocal Raman microscope spectrometer (600g/mm diffraction grating, with a diode continuous wave laser (473 nm, 25 mW) and a Synapse charge-coupled device camera. PL energy was calculated by the PL peak position of the optical emission spectra.
Starting materials: Lead(II) oxide (PbO, <10 μm, ReagentPlus®, ≥99.9% trace metals basis ), HI (57 wt. % in H2O), pentylamine 99%, H3PO2 (50 wt. % in H2O)
Product: orange plate-like crystals
Description: PbO powder (2232 mg, 10 mmol) was dissolved in 57% w/w aqueous HI solution (16 mL) in a 50 mL glass flask by heating to boiling under stirring. A bright yellow solution resulted. 1159 μL (10 mmol) of pentylamine in 50% aqueous H3PO2 (2 mL) was slowly added. The solution was slowly cooled to room temperature.
Method: UV-vis absorption (diffused reflectance)
Description: Optical diffuse-reflectance measurements were conducted at room temperature. A Shimadzu UV-2600 PC double-beam, double-monochromator spectrophotometer was operating from 200 to 2500 nm. BaS4 was used as a non-absorbing reflectance reference. Reflectance v. wavelength data was collected and used to estimate the band gap by converting reflectance to absorbance via the Kubelka-Munk equation: α/S = (1-R)^{2}/2R.
Crystal system: unknown
| Band gap (fundamental), eV |
|---|
Starting materials: PbO, HI, H3PO2, amylamine
Product: spin-coated thin film
Description: First step: (C5)2PbI4 single crystal flakes synthesized as follows: Slow-cooling in HI method: 2.232g (10 mmol) of PbO dissolved in glass vial containing 10 mL of HI and 1.7 mL of H3PO2. Brought to near-boiling temperature. 10 mmol of the organic amine mixed with 5 mL HI, cooled in an ice bath. Solutions were mixed and heated, then cooled to room temperature, upon which single crystal flakes form. Crystals were then washed thrice with diethyl ether and dried under a vacuum. Second step (thin film formation): Flakes were dissolved in 4:1 DMF:DMSO solvent mixture, stirred for 30 minutes. Substrate: quartz substrate with 120 nm gold layer of interdigitated fingers. Precursor solution (0.1-0.3 molar) pipetted onto substrate and then spun at 4000 rpm for 30 seconds, targeting film thickness of 80-300nm. Film was solvent-annealed, then enclosed with 2mL dH2O.
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: PbO, HI, H3PO2, amylamine
Product: spin-coated thin film
Description: First step: (C5)2PbI4 single crystal flakes synthesized as follows: Slow-cooling in HI method: 2.232g (10 mmol) of PbO dissolved in glass vial containing 10 mL of HI and 1.7 mL of H3PO2. Brought to near-boiling temperature. 10 mmol of the organic amine mixed with 5 mL HI, cooled in an ice bath. Solutions were mixed and heated, then cooled to room temperature, upon which single crystal flakes form. Crystals were then washed thrice with diethyl ether and dried under a vacuum. Second step (thin film formation): Flakes were dissolved in 4:1 DMF:DMSO solvent mixture, stirred for 30 minutes. Substrate: quartz substrate with 120 nm gold layer of interdigitated fingers. Precursor solution (0.1-0.3 molar) pipetted onto substrate and then spun at 4000 rpm for 30 seconds, targeting film thickness of 80-300nm. Film was solvent-annealed, then enclosed with 2mL dH2O.
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: PbO, HI, H3PO2, amylamine
Product: spin-coated thin film
Description: First step: (C5)2PbI4 single crystal flakes synthesized as follows: Slow-cooling in HI method: 2.232g (10 mmol) of PbO dissolved in glass vial containing 10 mL of HI and 1.7 mL of H3PO2. Brought to near-boiling temperature. 10 mmol of the organic amine mixed with 5 mL HI, cooled in an ice bath. Solutions were mixed and heated, then cooled to room temperature, upon which single crystal flakes form. Crystals were then washed thrice with diethyl ether and dried under a vacuum. Second step (thin film formation): Flakes were dissolved in 4:1 DMF:DMSO solvent mixture, stirred for 30 minutes. Substrate: quartz substrate with 120 nm gold layer of interdigitated fingers. Precursor solution (0.1-0.3 molar) pipetted onto substrate and then spun at 4000 rpm for 30 seconds, targeting film thickness of 80-300nm. Film was solvent-annealed, then enclosed with 2mL dH2O.
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.