Fig. 1: The MQW superlattices of 2D lead halide perovskites.
From: Scalable photonic sources using two-dimensional lead halide perovskite superlattices
Representative transmission electron micrographs of synthesized CQW nanocrystals (a; scale bar: 50 nm) and the cross sectional view of the fabricated MQW superlattice (b; d2D = 24.0 and dQB = 10.1 Å; scale bar: 10 nm). c The computer-generated schematic of lattice structure (color code: cyan, bromine; pink, hydrogen; brown, carbon; and blue, nitrogen). d The superlattice in the Miller coordinate (a, b, c) is deposited on a transparent substrate forming the air/superlattice/substrate dielectric stack. Upon excitation, the emission with the wave vector k with respect to the space coordinate (x, y, z) is characterized (right). e The GIWAXS diffractograms for the fabricated superlattices. The red dots correspond to the calculated superlattice (0 0 l) peak positions according to the c axis perpendicular to the x–y plane up to five orders, giving the superlattice d-spacing, d2D + dQB. As d2D is 24 Å, the dQB values were quantified accordingly.
