Fig. 3: Characterization of Au atom intercalated 2D-vdWH.
From: Electrically tunable two-dimensional heterojunctions for miniaturized near-infrared spectrometers
a Raman spectra for ReS2 layer, WSe2 layer, and ReS2/Au/WSe2 heterojunction, where the spectrum in the heterojunction region includes all the characteristic peaks from ReS2 and WSe2, of which the peaks are marked by the vertical black dash lines. Inset: Optical image of ReS2/Au/WSe2 heterostructure. Yellow and green dashed line depict WSe2 and ReS2, respectively. The scale bar is 10 μm. b HADDF-TEM images for atoms arrangements. The observed metal atoms are circled by the yellow ring. The crystal structure is aligned with the schematic atomic arrangement of WSe2. Inset: Zoom-in part of the dash frame. c Compared with atom intensities along the orange and blue lined atomic arrangements in the inset of b, obvious enhancement of a stochastic atom intensity can be observed, as the yellow circular mark. That illustrates that the Au atom locates right on the top of the wolfram (W) atom at its energy-favorable configuration. d The absorption spectra of ReS2/Au/WSe2, ReS2/WSe2, ReS2, and WSe2 at room temperature and 80 K in the visible and near-infrared range.
