Chemical vapor deposition (CVD) is a chemical process used to produce high-purity, high-performance solid materials. The process is often used in the semiconductor industry to produce thin films. In typical CVD, the wafer(substrate) is exposed to one or more volatile precursors, which react and/or decompose on the substrate surface to produce the desired deposit. Frequently, volatile by-products are also produced, which are removed by gas flow through the reaction chamber.

Microfabrication processes widely use CVD to deposit materials in various forms, including: monocrystalline,polycrystallineamorphous, and epitaxial. These materials include: siliconcarbon fibercarbon nanofibersfilaments,carbon nanotubesSiO2silicon-germaniumtungstensilicon carbidesilicon nitridesilicon oxynitridetitanium nitride, and various high-k dielectrics. CVD is also used to produce synthetic diamonds.

Source: Wikipedia