Thermal evaporation is a common method of physical vapor deposition (PVD). It is one of the simplest forms of PVD and typically uses a resistive heat source to evaporate a solid material in a vacuum environment to form a thin film. The material is heated in a high vacuum chamber until vapor pressure is produced. The evaporated material, or vapor stream, traverses the vacuum chamber with thermal energy and coats the substrate.
Thermal evaporation deposits both metals and nonmetals, including aluminum, chrome, gold, indium, and many others. This thin film deposition method is used most commonly for applications involving electrical contacts, by depositing such single metals as silver or aluminum. More complex applications include the co-deposition of several components and can be achieved by carefully controlling the temperature of individual crucibles.
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