Room Temperature CDW induced by Pressure in 2D organic-inorganic perovskite

We will measure nano beam single crystal XRD under extremely condition on (HA)2(FA)Pb2I7, which exhibits an edge state at ambient condition and a CDW and long-range order structure with pressure. This experiment will clarify below questions: 1) the origin of edge state at ambient condition, allowing a conclusion on the existence of the edge when the characteristic photoluminescence (PL) is suppressed at high pressure. This is important for the photovoltaic (PV) device design and applications. 2) detect the -vector of the CDW and long-range order phase originating from pressure. The results will give a complete explanation for our previous results.