Fig. 1. (a) Schematic diagram of the synthesis apparatus. (b) Structural illustration of a single layer (PEA)2PbBr4. The inorganic layer is made up of PbBr42− octahedra and the organic capping layers are 2-phenylethylammonium. The green, yellow, red and blue solid balls represent lead (Pb), bromide (Br), carbon (C), nitrogen (N) atoms, respectively. The hydrogen atoms are neglected. (c) Optical image of (PEA)2PbBr4 microplates. The scale bar is 10 μm. (d) AFM image of a typical (PEA)2PbBr4 microplate. The scale bar is 5 μm.
