Starting materials: (PEA)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. Refer to figure 5.
Starting materials: PbI2, BiI3, C6H5C2H4NH3I
Product: dark, red, platelike crystals, with a bismuth ratio Pb/Bi of approx. 0.3%
Description: Under an argon atmosphere, lead iodide (PbI2), bismuth iodide (BiI3) and phenylethylammonium iodide (C6H5C2H4NH3I) were mixed at a molar ratio of 0.9:0.1:2 and heated at 333K for a duration of 30 min. As a solvent, nitromethane was added for crystallization.
Method: PL-spectroscopy
Description: As a detector, a charge-coupled device (CCD) camera cooled by liquid nitrogen and equipped with a polychromator was utilized. PL spectra were measured with an excitation by Xe-lamp light at 2.48 eV.
DOI for this data set: 10.1103/PhysRevB.70.205330
Data set ID: 1939 Did you find any mistakes or inconsistencies about this data? Send us a note and we'll have a look at it and send you a reply. Thanks!Starting materials: phenethylammonium iodide (C8H12IN), lead iodide (PbI2)
Product: thin film
Description: (PEA)I, amd PbI2 made up the target solution in 1:1 DMSO/MEG by volume. They were mechanically mixed until visibly dissolved in solvent, taking about 5 min. In a growth chamber, the solution is cooled to -196°C under vacuum. When frozen, the top layer is removed using an Er:YAG laser (2.94 μm). The laser rasters across the surface to sublimate the MEG, causing the precursor material to be ejected onto the substrate (2 cm × 2 cm of SiO2 glass) spinning 7 cm above. The substrate temperature is approximately 10 °C while in the growth chamber. Deposit time was 4 h. Samples remained in a load lock under turbo vacuum (2 × 10–5 Torr) for an hour afterwards. The annealed films were additionally annealed for 10 min on a hot plate in an N2 environment at 110°.
Method: UV-vis photoluminescence
Description: PL spectroscopy measurements were taken using a HORIBA Jobin Yvon LabRam ARAMIS system. All films were excited using a 325 HeCd laser source with a 1% filter. Samples were kept in ambient air conditions.