Crystal system: monoclinic
| a: | 12.266 (±0.005) Å |
| b: | 12.276 (±0.005) Å |
| c: | 38.651 (±0.018) Å |
| α: | 90° |
| β: | 98.867 (±0.014)° |
| γ: | 90° |
Starting materials: PbI2 (99.999% trace metal basis), HI (57 wt % in H2O, with hypophosphorous acid as stabilizer, assay 99.95%), CH3OH (>99.9%), 2-(2-naphthyl)ethanamine (NEA, 95%)
Product: Red and laminar crystals.
Description: Dissolve PbI2 (27.0 mg) in 0.5 mL of HI (57%). Place CH3OH (1 ml) on top of the PbI2 solution. Add 0.020 mL of NEA liquid into the CH3OH layer. Crystals would form in the solution overnight.
Method: Single-crystal X-ray diffraction
Description: Single-crystal X-ray diffraction data were collected using a Bruker D8 ADVANCE Series II at room temperature. The crystal structures were solved and refined by Shelxl and Olex software.
Starting materials: (NEA)2PbI4 crystals, DMF, glass substrates
Product: Thin film on glass
Description: Dissolve the 2D single crystal 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.
Crystal system: monoclinic
| Photoluminescence peak position, nm |
|---|
Starting materials: (NEA)2PbI4 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.
Starting materials: (NEA)2PbI4 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.