Self-assembled heterostructure of 2D-layered tungsten disulfide (WS2) with Cadmium telluride (CdTe) quantum dots is reported. CdTe quantum dots (8 nm–10 nm) were intercalated into 2D-layered WS2 which showed an approximate lateral length distribution of 1 µm. X-ray photoelectron spectroscopic studies confirmed Cd (3d5/2, 3d3/2), Te (3d5/2, 3d3/2), W (4f7/2, 4f5/2) and S (2p3/2, 2p1/2) in the WS2-CdTe heterostructure which exhibited an optical absorption in the spectral range of 200 nm–550 nm. The dominant optical absorption around 250 nm is attributed to the quantum size effects occurred on both WS2 and CdTe. A sharp photoluminescence emission at 600 nm was further observed to be tunable with respect to concentration of CdTe quantum dots into the WS2 layers.
N. Suresh Powar, Ramanathan, K. Velu, Shantikumar V Nair, and Dr. Mariyappan Shanmugam, “Structural, nanomorphological and optical characteristics of self-assembled 2D-layered WS2-CdTe quantum dot heterostructure”, Materials Letters, vol. 285, p. 129139, 2021.