Fig. 1: Orientation control of self-assembled CsPbI3 NPLs.
From: Direct linearly polarized electroluminescence from perovskite nanoplatelet superlattices
a, Schematic illustrating how the orientation of the NPLs could be tuned by adjusting the solvent type and evaporation rate. The insets show TEM images of the face-down (top), mixed (middle) and edge-up (bottom) NPLs drop-cast onto copper TEM grids. b–d, Steady-state PL and UV–vis spectra of colloidal solutions of NPLs that were used to form the face-down (b), mixed (c) and edge-up (d) orientation NPL films, respectively. e–g, Two-dimensional GIWAXS data of face-down (e), mixed (f) and edge-up (g) NPL films. qz is the scattering vector component along the surface normal; qr is the scattering vector component in the sample plane.
