Construction of Structure-Controlled Perovskite Ultra-Thin Layers on Au(100) Single-Crystal Surface via Self-Assembled Monolayer of 4-Aminothiophenol

In order to control a crystal configuration of MAPbBr3 (MA = CH3NH3+) perovskite ultra-thin layers, the Au(100) single-crystal, the self-assembled monolayer (SAM) of 4-aminothiophenol (4-ATP), and the layer-by-layer alternating immersion were employed as a substrate, a linker between the perovskite thin layer and gold substrate, and a preparation method, respectively. Structure and crystal configuration of the constructed MAPbBr3 perovskite ultra-thin layers on 4-ATP SAM modified Au(100) were investigated by X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), and grazing incidence surface X-ray diffraction (GISXRD). As a result, we succeeded to construct the structure-controlled MAPbBr3 perovskite ultra-thin layers on the 4-ATP SAM modified Au(100) surface with an atomic dimension. By considering the plane orientation and interatomic distance of the substrate surface, by introducing a flexible organic monolayer as a linker, and by alternating immersion method, it is succeeded to construct the structure-controlled MAPbBr3 (MA = CH3NH3+) perovskite ultra-thin layers on the 4-aminothiophenol (4-ATP) self-assembled monolayer (SAM) modified Au(100) surface with an atomic dimension.