Fig. 2: Transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS) results of Au/Ag/CrPS4/Au devices.

High-angle annular dark-field scanning TEM (HAADF STEM) images and EDS mapping images of the Au/Ag/CrPS4/Au devices in the a initial state, b low-resistance state, and c high-resistance state. d EDS line profiles showing the compositional changes through the thickness direction of the Au/Ag/CrPS4/Au devices.