fig1

Figure 1. Quantum and dielectric confinement effects of 2D perovskites. (A and B) Schematic illustration of (A) anisotropic properties and (B) 2D quantum well structure of 2D perovskites. Reprinted with permission from ref.^[15]: Copyright 2019, American Chemical Society. (C) Schematic illustration of quantum confinement and incorporation of quantum and dielectric confinement. (D) Simulated result of optical absorption from quantum confinement and dielectric confinement due to 1 s excitons. The black line is the optical absorption of the 3D halide perovskite, the blue line is of the 2D with only quantum confinement, and the red line is of the 2D with both quantum and dielectric confinement. Reprinted with permission from ref.^[20]: Copyright 2016, American Chemical Society.