Fig. 1. Structure and photophysical properties of a quasi-2D perovskite.
a (i) Schematic representation of a quasi-2D perovskite, which can be obtained by slicing the 3D perovskite along the <100> crystallographic direction. (ii) Schematic crystal structures of quasi-2D perovskites with different n-values. (iii) Electronic properties of quasi-2D perovskites, which are determined by the degree of quantum- and dielectric-confinement effects. b Eb and PL emission wavelength of quasi-2D perovskites as a function of n-value. Panel b is reprinted from ref. 51 with permission from Wiley