2D semiconductor materials are often synthesized using a chemical vapor deposition (CVD) method. Because CVD can provide large-area, high-quality, and well-controlled layered growth of 2D semiconductor materials, it also allows synthesis of two-dimensional heterojunctions. When building devices by stacking different 2D materials, mechanical exfoliation followed by transferring is often used. Other possible synthesis methods include electrochemical deposition, chemical exfoliation, hydrothermal synthesis, and thermal decomposition. In 2008 cadmium selenide CdSe quasi 2D platelets were first synthesized by colloidal method with thicknesses of several atomic layers and lateral sizes up to dozens of nanometers. Modification of the procedure allowed to obtain other nanoparticles with different compositions (like CdTe, HgSe, CdSe x S 1−x alloys, core/shell and core/crown heterostructures) and shapes (as scrolls, nanoribbons, etc).