Crystal system: orthorhombic
| a: | 8.843 (±0.002) Å |
| b: | 8.5023 (±0.0018) Å |
| c: | 48.988 (±0.009) Å |
| α: | 90° |
| β: | 90° |
| γ: | 90° |
Crystal system: orthorhombic
| a: | 8.699 (±0.003) Å |
| b: | 8.437 (±0.003) Å |
| c: | 49.179 (±0.013) Å |
| α: | 90° |
| β: | 90° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.314 (±0.007) Å |
| b: | 8.947 (±0.008) Å |
| c: | 23.75 (±0.02) Å |
| α: | 90° |
| β: | 95.33 (±0.08)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.284 (±0.007) Å |
| b: | 8.975 (±0.009) Å |
| c: | 23.75 (±0.02) Å |
| α: | 90° |
| β: | 95.31 (±0.08)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.277 (±0.007) Å |
| b: | 8.9676 (±0.0009) Å |
| c: | 23.75 (±0.02) Å |
| α: | 90° |
| β: | 95.3 (±0.8)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.285 (±0.007) Å |
| b: | 8.98 (±0.009) Å |
| c: | 23.76 (±0.02) Å |
| α: | 90° |
| β: | 95.32 (±0.08)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.282 (±0.007) Å |
| b: | 8.977 (±0.009) Å |
| c: | 23.75 (±0.02) Å |
| α: | 90° |
| β: | 95.27 (±0.08)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.293 (±0.007) Å |
| b: | 8.967 (±0.009) Å |
| c: | 23.76 (±0.02) Å |
| α: | 90° |
| β: | 95.29 (±0.07)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.282 (±0.008) Å |
| b: | 8.978 (±0.01) Å |
| c: | 23.77 (±0.02) Å |
| α: | 90° |
| β: | 95.38 (±0.08)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.313 (±0.007) Å |
| b: | 8.946 (±0.008) Å |
| c: | 23.75 (±0.02) Å |
| α: | 90° |
| β: | 95.33 (±0.07)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.332 (±0.007) Å |
| b: | 8.958 (±0.008) Å |
| c: | 23.774 (±0.019) Å |
| α: | 90° |
| β: | 95.23 (±0.06)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.357 (±0.006) Å |
| b: | 8.964 (±0.007) Å |
| c: | 23.787 (±0.017) Å |
| α: | 90° |
| β: | 95.31 (±0.06)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.376 (±0.007) Å |
| b: | 8.968 (±0.008) Å |
| c: | 23.809 (±0.019) Å |
| α: | 90° |
| β: | 95.4 (±0.7)° |
| γ: | 90° |
Crystal system: monoclinic
| a: | 8.415 (±0.01) Å |
| b: | 8.954 (±0.011) Å |
| c: | 23.86 (±0.03) Å |
| α: | 90° |
| β: | 95.77 (±0.09)° |
| γ: | 90° |
Crystal system: orthorhombic
| a: | 8.759 (±0.003) Å |
| b: | 8.476 (±0.003) Å |
| c: | 49.115 (±0.014) Å |
| α: | 90° |
| β: | 90° |
| γ: | 90° |
Crystal system: orthorhombic
| a: | 8.839 (±0.003) Å |
| b: | 8.501 (±0.002) Å |
| c: | 48.962 (±0.011) Å |
| α: | 90° |
| β: | 90° |
| γ: | 90° |
Starting materials: HI, DA (C12H25NH3), Et2O, PbI2
Product: Powder of (C12H25NH3)2PbI4
Description: Prepare dodecylammonium iodide salts via neutralization of HI with DA. Remove unreacted species by evaporation. Purify product by recrystallization in minimal diethyl ether/excess hexane and isolate via vacuum filtration. Prepare films by spin-coating or drop-casting solutions (prepared by dissolving DAI and PbI2 powders at a 2.5:1 molar ratio in a 1:0.34 volume ratio mixture of THF and methanol). To prepare powder for XRD, drop-cast thin film from 200 mg/mL solutions and anneal at 70 °C for 15 min.
Method: Powder X-ray diffraction
Description: Bruker X-ray D8 Advance diffractometer with Cu Kα1,2 radiation (λ = 1.541 Å). Spectra were collected with an angular range of 5 < 2θ < 60° and step size of 0.01022° over 60 minutes. Rietveld analysis was carried out using the TOPAS program. Low-temperature measurements were made on cooling between 300−12K using an Oxford Cyrosytem PheniX stage.
Comment: CIF file available at DOI link
Crystal system: orthorhombic
| Photoluminescence peak position, nm |
|---|
Starting materials: HI, DA (C12H25NH3), Et2O, PbI2
Product: Thin film of (C12H25NH3)2PbI4
Description: Prepare dodecylammonium iodide salts via neutralization of HI with DA. Remove unreacted species by evaporation. Purify product by recrystallization in minimal diethyl ether/excess hexane and isolate via vacuum filtration. Prepare films by spin-coating or drop-casting solutions (prepared by dissolving DAI and PbI2 powders at a 2.5:1 molar ratio in a 1:0.34 volume ratio mixture of THF and methanol). Spin-coat films from solutions of 20 mg/mL at 2000 rpm for 30 s and anneal for 15 min at 70 °C.
Method: Photoluminescence spectra
Description: Steady-state photoluminescence emission spectra of spin-coated films on glass were measured at room temperature with a step size of 1 nm in an Edinburgh Instruments FLS980 fluorimeter by exciting with monochromated light with a 2 nm bandwidth at 480 nm.
Comment: Refer to Figure 1 for PL spectra
See all entries for this property (2 total)
Starting materials: Lead(II) oxide (Sigma Aldrich, 99.9%), decylamine (Sigma Aldrich, 99%), hydriodic acid (Sigma Aldrich, 57% w/w in H2O, 99.9%)
Product: (DA)2PbI4 crystals
Description: (DA)2PbI4 single crystals were synthesized by dissolving lead oxide (0.5 mmol) in 20 mL of hydriodic acid by heating to boiling under constant stirring. To it, 0.5 mmol of decylamine was added. The solution was heated and stirred until the precipitate dissolved completely. Then the solution was allowed to cool naturally to room temperature.
Method: UV-visible absorption
Description: UV-Visible absorbance data were recorded on the transmission mode in Cary Series UV-Vis Spectrophotometer (Agilent Technologies).
Starting materials: HI, DA (C12H25NH3), Et2O, PbI2
Product: Thin film of (C12H25NH3)2PbI4
Description: Prepare dodecylammonium iodide salts via neutralization of HI with DA. Remove unreacted species by evaporation. Purify product by recrystallization in minimal diethyl ether/excess hexane and isolate via vacuum filtration. Prepare films by spin-coating or drop-casting solutions (prepared by dissolving DAI and PbI2 powders at a 2.5:1 molar ratio in a 1:0.34 volume ratio mixture of THF and methanol). Spin-coat films from solutions of 20 mg/mL at 2000 rpm for 30 s and anneal for 15 min at 70 °C.
Method: Photoluminescence spectra
Description: Steady-state photoluminescence emission spectra of spin-coated films on glass were measured at room temperature with a step size of 1 nm in an Edinburgh Instruments FLS980 fluorimeter by exciting with monochromated light with a 2 nm bandwidth at 480 nm.
Crystal system: unknown
| Band gap (fundamental), eV |
|---|
Starting materials: PbO, HI, H3PO2, dodecylamine
Product: spin-coated thin film
Description: First step: (C12)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, dodecylamine
Product: spin-coated thin film
Description: First step: (C12)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, dodecylamine
Product: spin-coated thin film
Description: First step: (C12)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.