Fig. 4: The thickness-dependent Raman spectra of atomically thin Cs3Bi2Br9.
From: Colloid driven low supersaturation crystallization for atomically thin Bismuth halide perovskite
a Raman spectra of the atomically thin Cs3Bi2Br9 with a thickness range from 300 nm to 2.67 nm. b Statistical analysis of the A1g vibration as a function of the thickness range from 300 nm to 2.67 nm. The insert illustrates the A1g vibration in the [BiBr6]3- octahedron. c Statistics of the Eg vibration as a function of the thickness range from 300 nm to 2.67 nm. The insert illustrates the Eg vibration in the [BiBr6]3- octahedron. Source data are provided as a Source Data file.
