Figure 3.

(A) Absorption and PL spectra of CsPbBr₃ as a thin film (see Figure SI13), cube-shaped nanocrystals, and NPLs of different thicknesses. (B) Employed cubic CsPbBr₃ 2D slabs and unit supercell. a–b are the periodic dimensions. (C) Comparison of the experimental (green line) and SR- and SOC-DFT calculated band gaps (black line and red line, respectively) as a function of the NPLs inverse squared dimension (1/r²).